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coefficient – Quasiperiodic superlattices- singularly localized and extended states- structural parameters- Laser with modulated wavelength</title> <meta name="description" content="Search results for: transmission coefficient – Quasiperiodic superlattices- singularly localized and extended states- structural parameters- Laser with modulated wavelength"> <meta name="keywords" content="transmission coefficient – Quasiperiodic superlattices- singularly localized and extended states- structural parameters- Laser with modulated wavelength"> <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no"> <meta charset="utf-8"> <link href="https://cdn.waset.org/favicon.ico" type="image/x-icon" rel="shortcut icon"> <link href="https://cdn.waset.org/static/plugins/bootstrap-4.2.1/css/bootstrap.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/plugins/fontawesome/css/all.min.css" rel="stylesheet"> <link 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class="row mt-3"> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Commenced</strong> in January 2007</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Frequency:</strong> Monthly</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Edition:</strong> International</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Paper Count:</strong> 20320</div> </div> </div> </div> <h1 class="mt-3 mb-3 text-center" style="font-size:1.6rem;">Search results for: transmission coefficient – Quasiperiodic superlattices- singularly localized and extended states- structural parameters- Laser with modulated wavelength</h1> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">20320</span> Effect of the Structural Parameters on Subbands of Fibonacci AlxGa1-xAs/GaAs Superlattices</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Y.%20Sefir">Y. Sefir</a>, <a href="https://publications.waset.org/abstracts/search?q=Z.%20Aziz"> Z. Aziz</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Cherid"> S. Cherid</a>, <a href="https://publications.waset.org/abstracts/search?q=Z.%20F.%20Meghoufel"> Z. F. Meghoufel</a>, <a href="https://publications.waset.org/abstracts/search?q=F.%20Bendahama"> F. Bendahama</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Terkhi"> S. Terkhi</a>, <a href="https://publications.waset.org/abstracts/search?q=B.%20Bouadjemi.%20A.%20Zitouni%20S.%20Bentata"> B. Bouadjemi. A. Zitouni S. Bentata</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This work is to study the effect of the variation of structural parameters on the band structure in the quasiperiodic Fibonacci superlattices AlxGa1-xAs/GaAs using the formalism of the transfer matrix and Airy function. Our results show that increasing the width of Fibonacci’s wells of allows to the confinement of subminibands with a widening of minigaps, this causes a consistent and coherent fragmentation. The barrier thickness of Fibonacci bf acts on the width of subminibands by controlling the interaction force between neighboring eigenstates. Its increase gives rise to singularly extended states. The barrier height Fibonacci Vf permit to control the degree of structural disorder in these structures. The variation of these parameters permits the design of laser with modulated wavelength. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=transmission%20coefficient%20%E2%80%93%20Quasiperiodic%20superlattices-%20singularly%20localized%20and%20extended%20states-%20structural%20parameters-%20Laser%20with%20modulated%20wavelength" title="transmission coefficient – Quasiperiodic superlattices- singularly localized and extended states- structural parameters- Laser with modulated wavelength">transmission coefficient – Quasiperiodic superlattices- singularly localized and extended states- structural parameters- Laser with modulated wavelength</a> </p> <a href="https://publications.waset.org/abstracts/39812/effect-of-the-structural-parameters-on-subbands-of-fibonacci-alxga1-xasgaas-superlattices" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/39812.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">375</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">20319</span> Effect of the Aluminium Concentration on the Laser Wavelength of Random Trimer Barrier AlxGa1-xAs Superlattices</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Samir%20Bentata">Samir Bentata</a>, <a href="https://publications.waset.org/abstracts/search?q=Fatima%20Bendahma"> Fatima Bendahma</a> </p> <p class="card-text"><strong>Abstract:</strong></p> We have numerically investigated the effect of Aluminium concentration on the the laser wavelength of random trimer barrier AlxGa1-xAs superlattices (RTBSL). Such systems consist of two different structures randomly distributed along the growth direction, with the additional constraint that the barriers of one kind appear in triply. An explicit formula is given for evaluating the transmission coefficient of superlattices (SL's) with intentional correlated disorder. The method is based on Airy function formalism and the transfer-matrix technique. We discuss the impact of the Aluminium concentration associate to the structure profile on the laser wavelengths. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=superlattices" title="superlattices">superlattices</a>, <a href="https://publications.waset.org/abstracts/search?q=correlated%20disorder" title=" correlated disorder"> correlated disorder</a>, <a href="https://publications.waset.org/abstracts/search?q=transmission%20coefficient" title=" transmission coefficient"> transmission coefficient</a>, <a href="https://publications.waset.org/abstracts/search?q=laser%20wavelength" title=" laser wavelength "> laser wavelength </a> </p> <a href="https://publications.waset.org/abstracts/15343/effect-of-the-aluminium-concentration-on-the-laser-wavelength-of-random-trimer-barrier-alxga1-xas-superlattices" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/15343.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">339</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">20318</span> Study of Quantum Lasers of Random Trimer Barrier AlxGa1-xAs Superlattices</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Bentata%20Samir">Bentata Samir</a>, <a href="https://publications.waset.org/abstracts/search?q=Bendahma%20Fatima"> Bendahma Fatima</a> </p> <p class="card-text"><strong>Abstract:</strong></p> We have numerically studied the random trimer barrier AlxGa1-xAs superlattices (RTBSL). Such systems consist of two different structures randomly distributed along the growth direction, with the additional constraint that the barriers of one kind appear in triply. An explicit formula is given for evaluating the transmission coefficient of superlattices (SL's) in intentional correlated disorder. We have specially investigated the effect of aluminum concentration on the laser wavelength. We discuss the impact of the aluminum concentration associated with the structure profile on the laser wavelengths. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=superlattices" title="superlattices">superlattices</a>, <a href="https://publications.waset.org/abstracts/search?q=transfer%20matrix%20method" title=" transfer matrix method"> transfer matrix method</a>, <a href="https://publications.waset.org/abstracts/search?q=transmission%20coefficient" title=" transmission coefficient"> transmission coefficient</a>, <a href="https://publications.waset.org/abstracts/search?q=quantum%20laser" title=" quantum laser"> quantum laser</a> </p> <a href="https://publications.waset.org/abstracts/24970/study-of-quantum-lasers-of-random-trimer-barrier-alxga1-xas-superlattices" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/24970.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">492</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">20317</span> Effect of Spatially Correlated Disorder on Electronic Transport Properties of Aperiodic Superlattices (GaAs/AlxGa1-xAs)</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=F.%20Bendahma">F. Bendahma</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Bentata"> S. Bentata</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Cherid"> S. Cherid</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Zitouni"> A. Zitouni</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Terkhi"> S. Terkhi</a>, <a href="https://publications.waset.org/abstracts/search?q=T.%20Lantri"> T. Lantri</a>, <a href="https://publications.waset.org/abstracts/search?q=Y.%20Sefir"> Y. Sefir</a>, <a href="https://publications.waset.org/abstracts/search?q=Z.%20F.%20Meghoufel"> Z. F. Meghoufel</a> </p> <p class="card-text"><strong>Abstract:</strong></p> We examine the electronic transport properties in Al<sub>x</sub>Ga<sub>1-x</sub>As/GaAs superlattices. Using the transfer-matrix technique and the exact Airy function formalism, we investigate theoretically the effect of structural parameters on the electronic energy spectra of trimer thickness barrier (TTB). Our numerical calculations showed that the localization length of the states becomes more extended when the disorder is correlated (trimer case). We have also found that the resonant tunneling time (RTT) is of the order of several femtoseconds. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=electronic%20transport%20properties" title="electronic transport properties">electronic transport properties</a>, <a href="https://publications.waset.org/abstracts/search?q=structural%20parameters" title=" structural parameters"> structural parameters</a>, <a href="https://publications.waset.org/abstracts/search?q=superlattices" title=" superlattices"> superlattices</a>, <a href="https://publications.waset.org/abstracts/search?q=transfer-matrix%20technique" title=" transfer-matrix technique"> transfer-matrix technique</a> </p> <a href="https://publications.waset.org/abstracts/53880/effect-of-spatially-correlated-disorder-on-electronic-transport-properties-of-aperiodic-superlattices-gaasalxga1-xas" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/53880.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">285</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">20316</span> Probabilistic Modeling Laser Transmitter</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=H.%20S.%20Kang">H. S. Kang</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Coupled electrical and optical model for conversion of electrical energy into coherent optical energy for transmitter-receiver link by solid state device is presented. Probability distribution for travelling laser beam switching time intervals and the number of switchings in the time interval is obtained. Selector function mapping is employed to regulate optical data transmission speed. It is established that regulated laser transmission from PhotoActive Laser transmitter follows principal of invariance. This considerably simplifies design of PhotoActive Laser Transmission networks. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=computational%20mathematics" title="computational mathematics">computational mathematics</a>, <a href="https://publications.waset.org/abstracts/search?q=finite%20difference%20Markov%20chain%20methods" title=" finite difference Markov chain methods"> finite difference Markov chain methods</a>, <a href="https://publications.waset.org/abstracts/search?q=sequence%20spaces" title=" sequence spaces"> sequence spaces</a>, <a href="https://publications.waset.org/abstracts/search?q=singularly%20perturbed%20differential%20equations" title=" singularly perturbed differential equations"> singularly perturbed differential equations</a> </p> <a href="https://publications.waset.org/abstracts/8445/probabilistic-modeling-laser-transmitter" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/8445.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">432</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">20315</span> Formation of Miniband Structure in Dimer Fibonacci GaAs/Ga1-XAlXAs Superlattices </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Aziz%20Zoubir">Aziz Zoubir</a>, <a href="https://publications.waset.org/abstracts/search?q=Sefir%20Yamina"> Sefir Yamina</a>, <a href="https://publications.waset.org/abstracts/search?q=Djelti%20Redouan"> Djelti Redouan</a>, <a href="https://publications.waset.org/abstracts/search?q=Bentata%20Samir"> Bentata Samir</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The effect of a uniform electric field across multibarrier systems (GaAs/AlxGa1-xAs) is exhaustively explored by a computational model using exact Airy function formalism and the transfer-matrix technique. In the case of biased Dimer Fibonacci Height Barrier superlattices (DFHBSL) structure a strong reduction in transmission properties was observed and the width of the miniband structure linearly decreases with the increase of the applied bias. This is due to the confinement of the states in the miniband structure, which becomes increasingly important (Wannier-Stark effect). <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Dimer%20Fibonacci%20Height%20Barrier%20superlattices" title="Dimer Fibonacci Height Barrier superlattices">Dimer Fibonacci Height Barrier superlattices</a>, <a href="https://publications.waset.org/abstracts/search?q=singular%20extended%20states" title=" singular extended states"> singular extended states</a>, <a href="https://publications.waset.org/abstracts/search?q=exact%20Airy%20function" title=" exact Airy function"> exact Airy function</a>, <a href="https://publications.waset.org/abstracts/search?q=transfer%20matrix%20formalism" title=" transfer matrix formalism"> transfer matrix formalism</a> </p> <a href="https://publications.waset.org/abstracts/14193/formation-of-miniband-structure-in-dimer-fibonacci-gaasga1-xalxas-superlattices" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/14193.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">509</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">20314</span> Influence of Strong Optical Feedback on Frequency Chirp and Lineshape Broadening in High-Speed Semiconductor Laser</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Moustafa%20Ahmed">Moustafa Ahmed</a>, <a href="https://publications.waset.org/abstracts/search?q=Fumio%20Koyama"> Fumio Koyama</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Directly-modulated semiconductor lasers, including edge-emitting and vertical-cavity surface-emitting lasers, have received considerable interest recently for use in data transmitters in cost-effective high-speed data centers, metro, and access networks. Optical feedback has been proved as an efficient technique to boost the modulation bandwidth and enhance the speed of the semiconductor laser. However, both the laser linewidth and frequency chirping in directly-modulated lasers are sensitive to both intensity modulation and optical feedback. These effects along width fiber dispersion affect the transmission bit rate and distance in single-mode fiber links. In this work, we continue our recent research on directly-modulated semiconductor lasers with modulation bandwidth in the millimeter-wave band by introducing simultaneous modeling and simulations on both the frequency chirping and lineshape broadening. The lasers are operating under strong optical feedback. The model takes into account the multiple reflections of laser reflections of laser radiation in the external cavity. The analyses are given in terms of the chirp-to-modulated power ratio, and the results are shown for the possible dynamic states of continuous wave, period-1 oscillation, and chaos. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=chirp" title="chirp">chirp</a>, <a href="https://publications.waset.org/abstracts/search?q=linewidth" title=" linewidth"> linewidth</a>, <a href="https://publications.waset.org/abstracts/search?q=optical%20feedback" title=" optical feedback"> optical feedback</a>, <a href="https://publications.waset.org/abstracts/search?q=semiconductor%20laser" title=" semiconductor laser"> semiconductor laser</a> </p> <a href="https://publications.waset.org/abstracts/79640/influence-of-strong-optical-feedback-on-frequency-chirp-and-lineshape-broadening-in-high-speed-semiconductor-laser" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/79640.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">482</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">20313</span> Effect of the Aluminum Fraction “X” on the Laser Wavelengths in GaAs/AlxGa1-xAs Superlattices</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=F.Bendahma">F.Bendahma</a>, <a href="https://publications.waset.org/abstracts/search?q=S.Bentata"> S.Bentata</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this paper, we study numerically the eigenstates existing in a GaAs/AlxGa1-xAs superlattice with structural disorder in trimer height barrier (THB). Aluminium concentration x takes at random two different values, one of them appears only in triply and remains inferior to the second in the studied structure. In spite of the presence of disorder, the system exhibits two kinds of sets of propagating states lying below the barrier due to the characteristic structure of the superlattice. This result allows us to note the existence of a single laser emission in trimer and wavelengths are obtained in the mid-infrared. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=infrared%20%28IR%29" title="infrared (IR)">infrared (IR)</a>, <a href="https://publications.waset.org/abstracts/search?q=laser%20emission" title=" laser emission"> laser emission</a>, <a href="https://publications.waset.org/abstracts/search?q=superlattice" title=" superlattice"> superlattice</a>, <a href="https://publications.waset.org/abstracts/search?q=trimer" title=" trimer "> trimer </a> </p> <a href="https://publications.waset.org/abstracts/34254/effect-of-the-aluminum-fraction-x-on-the-laser-wavelengths-in-gaasalxga1-xas-superlattices" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/34254.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">449</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">20312</span> Effect of the Applied Bias on Miniband Structures in Dimer Fibonacci Inas/Ga1-Xinxas Superlattices</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Z.%20Aziz">Z. Aziz</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Terkhi"> S. Terkhi</a>, <a href="https://publications.waset.org/abstracts/search?q=Y.%20Sefir"> Y. Sefir</a>, <a href="https://publications.waset.org/abstracts/search?q=R.%20Djelti"> R. Djelti</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Bentata"> S. Bentata</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The effect of a uniform electric field across multibarrier systems (InAs/InxGa1-xAs) is exhaustively explored by a computational model using exact airy function formalism and the transfer-matrix technique. In the case of biased DFHBSL structure a strong reduction in transmission properties was observed and the width of the miniband structure linearly decreases with the increase of the applied bias. This is due to the confinement of the states in the miniband structure, which becomes increasingly important (Wannier-Stark Effect). <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=dimer%20fibonacci%20height%20barrier%20superlattices" title="dimer fibonacci height barrier superlattices">dimer fibonacci height barrier superlattices</a>, <a href="https://publications.waset.org/abstracts/search?q=singular%20extended%20state" title=" singular extended state"> singular extended state</a>, <a href="https://publications.waset.org/abstracts/search?q=exact%20airy%20function" title=" exact airy function"> exact airy function</a>, <a href="https://publications.waset.org/abstracts/search?q=transfer%20matrix%20formalism" title=" transfer matrix formalism"> transfer matrix formalism</a> </p> <a href="https://publications.waset.org/abstracts/3930/effect-of-the-applied-bias-on-miniband-structures-in-dimer-fibonacci-inasga1-xinxas-superlattices" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/3930.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">307</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">20311</span> Performance Analysis of Vertical Cavity Surface Emitting Laser and Distributed Feedback Laser for Community Access Television</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Ashima%20Rai">Ashima Rai</a> </p> <p class="card-text"><strong>Abstract:</strong></p> CATV transmission systems have altered from old cable based one-way analog video transmission to two ways hybrid fiber transmission. The use of optical fiber reduces the RF amplifiers in the transmission, high transmission power or lower fiber transmission losses are required to increase system capability. This paper evaluates and compares Distributed Feedback (DFB) laser and Vertical Cavity Surface Emitting Laser (VCSEL) for CATV transmission. The simulation results exhibit the better performer among both lasers taking into consideration the parameters chosen for evaluation. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Distributed%20Feedback%20%28DFB%29" title="Distributed Feedback (DFB)">Distributed Feedback (DFB)</a>, <a href="https://publications.waset.org/abstracts/search?q=Vertical%20Cavity%20Surface%20Emitting%20Laser%20%28VCSEL%29" title=" Vertical Cavity Surface Emitting Laser (VCSEL)"> Vertical Cavity Surface Emitting Laser (VCSEL)</a>, <a href="https://publications.waset.org/abstracts/search?q=Community%20Access%20Television%20%28CATV%29" title=" Community Access Television (CATV)"> Community Access Television (CATV)</a>, <a href="https://publications.waset.org/abstracts/search?q=Composite%20Second%20Order%20%28CSO%29" title=" Composite Second Order (CSO)"> Composite Second Order (CSO)</a>, <a href="https://publications.waset.org/abstracts/search?q=Composite%20Triple%20Beat%20%28CTB%29" title=" Composite Triple Beat (CTB)"> Composite Triple Beat (CTB)</a>, <a href="https://publications.waset.org/abstracts/search?q=RF" title=" RF"> RF</a> </p> <a href="https://publications.waset.org/abstracts/70954/performance-analysis-of-vertical-cavity-surface-emitting-laser-and-distributed-feedback-laser-for-community-access-television" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/70954.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">359</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">20310</span> Study on Fabrication of Surface Functional Micro and Nanostructures by Femtosecond Laser</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Shengzhu%20Cao">Shengzhu Cao</a>, <a href="https://publications.waset.org/abstracts/search?q=Hui%20Zhou"> Hui Zhou</a>, <a href="https://publications.waset.org/abstracts/search?q=Gan%20Wu"> Gan Wu</a>, <a href="https://publications.waset.org/abstracts/search?q=Lanxi%20Wanhg"> Lanxi Wanhg</a>, <a href="https://publications.waset.org/abstracts/search?q=Kaifeng%20Zhang"> Kaifeng Zhang</a>, <a href="https://publications.waset.org/abstracts/search?q=Rui%20Wang"> Rui Wang</a>, <a href="https://publications.waset.org/abstracts/search?q=Hu%20Wang"> Hu Wang</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The functional micro and nanostructures, which can endow material surface with unique properties such as super-absorptance, hydrophobic and drag reduction. Recently, femtosecond laser ablation has been demonstrated to be a promising technology for surface functional micro and nanostructures fabrication. In this paper, using femtosecond laser ablation processing technique, we fabricated functional micro and nanostructures on Ti and Al alloy surfaces, test results showed that processed surfaces have 82%~96% absorptance over a broad wavelength range from ultraviolet to infrared. The surface function properties, which determined by micro and nanostructures, could be modulated by variation laser parameters. These functional surfaces may find applications in such areas as photonics, plasmonics, spaceborne devices, thermal radiation sources, solar energy absorbers and biomedicine. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=surface%20functional" title="surface functional">surface functional</a>, <a href="https://publications.waset.org/abstracts/search?q=micro%20and%20nanostructures" title=" micro and nanostructures"> micro and nanostructures</a>, <a href="https://publications.waset.org/abstracts/search?q=femtosecond%20laser" title=" femtosecond laser"> femtosecond laser</a>, <a href="https://publications.waset.org/abstracts/search?q=ablation" title=" ablation"> ablation</a> </p> <a href="https://publications.waset.org/abstracts/61480/study-on-fabrication-of-surface-functional-micro-and-nanostructures-by-femtosecond-laser" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/61480.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">370</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">20309</span> Effect of the Applied Bias on Mini-Band Structures in Dimer Fibonacci InAs/Ga1-XInXAs Superlattices</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Z.%20Aziz">Z. Aziz</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Terkhi"> S. Terkhi</a>, <a href="https://publications.waset.org/abstracts/search?q=Y.%20Sefir"> Y. Sefir</a>, <a href="https://publications.waset.org/abstracts/search?q=R.%20Djelti"> R. Djelti</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Bentata"> S. Bentata</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The effect of a uniform electric field across multi-barrier systems (InAs/InxGa1-xAs) is exhaustively explored by a computational model using exact Airy function formalism and the transfer-matrix technique. In the case of biased DFHBSL structure a strong reduction in transmission properties was observed and the width of the mini-band structure linearly decreases with the increase of the applied bias. This is due to the confinement of the states in the mini-band structure, which becomes increasingly important (Wannier-Stark Effect). <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=dimer%20fibonacci%20height%20barrier%20superlattices" title="dimer fibonacci height barrier superlattices">dimer fibonacci height barrier superlattices</a>, <a href="https://publications.waset.org/abstracts/search?q=singular%20extended%20state" title=" singular extended state"> singular extended state</a>, <a href="https://publications.waset.org/abstracts/search?q=exact%20Airy%20function%20and%20transfer%20matrix%20formalism" title=" exact Airy function and transfer matrix formalism"> exact Airy function and transfer matrix formalism</a>, <a href="https://publications.waset.org/abstracts/search?q=bioinformatics" title=" bioinformatics"> bioinformatics</a> </p> <a href="https://publications.waset.org/abstracts/2231/effect-of-the-applied-bias-on-mini-band-structures-in-dimer-fibonacci-inasga1-xinxas-superlattices" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/2231.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">290</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">20308</span> A Compact Extended Laser Diode Cavity Centered at 780 nm for Use in High-Resolution Laser Spectroscopy</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=J.%20Alvarez">J. Alvarez</a>, <a href="https://publications.waset.org/abstracts/search?q=J.%20Pimienta"> J. Pimienta</a>, <a href="https://publications.waset.org/abstracts/search?q=R.%20Sarmiento"> R. Sarmiento</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Diode lasers working in free mode present different shifting and broadening determined by external factors such as temperature, current or mechanical vibrations, and they are not more useful in applications such as spectroscopy, metrology, and cooling of atoms, among others. Different configurations can reduce the spectral width of a laser; one of the most effective is to extend the optical resonator of the laser diode and use optical feedback either with the help of a partially reflective mirror or with a diffraction grating; this latter configuration is not only allowed to reduce the spectral width of the laser line but also to coarsely adjust its working wavelength, within a wide range typically ~ 10nm by slightly varying the angle of the diffraction grating. Two settings are commonly used for this purpose, the Littrow configuration and the Littmann Metcalf. In this paper, we present the design, construction, and characterization of a compact extended laser cavity in Littrow configuration. The designed cavity is compact and was machined on an aluminum block using computer numerical control (CNC); it has a mass of only 380 g. The design was tested on laser diodes with different wavelengths, 650nm, 780nm, and 795 nm, but can be equally efficient at other wavelengths. This report details the results obtained from the extended cavity working at a wavelength of 780 nm, with an output power of around 35mW and a line width of less than 1Mhz. The cavity was used to observe the spectrum of the corresponding Rubidium D2 line. By modulating the current and with the help of phase detection techniques, a dispersion signal with an excellent signal-to-noise ratio was generated that allowed the stabilization of the laser to a transition of the hyperfine structure of Rubidium with an integral proportional controller (PI) circuit made with precision operational amplifiers. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Littrow" title="Littrow">Littrow</a>, <a href="https://publications.waset.org/abstracts/search?q=Littman-Metcalf" title=" Littman-Metcalf"> Littman-Metcalf</a>, <a href="https://publications.waset.org/abstracts/search?q=line%20width" title=" line width"> line width</a>, <a href="https://publications.waset.org/abstracts/search?q=laser%20stabilization" title=" laser stabilization"> laser stabilization</a>, <a href="https://publications.waset.org/abstracts/search?q=hyperfine%20structure" title=" hyperfine structure"> hyperfine structure</a> </p> <a href="https://publications.waset.org/abstracts/145561/a-compact-extended-laser-diode-cavity-centered-at-780-nm-for-use-in-high-resolution-laser-spectroscopy" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/145561.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">228</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">20307</span> Laser Irradiated GeSn Photodetector for Improved Infrared Photodetection</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Patrik%20Scajev">Patrik Scajev</a>, <a href="https://publications.waset.org/abstracts/search?q=Pavels%20Onufrijevs"> Pavels Onufrijevs</a>, <a href="https://publications.waset.org/abstracts/search?q=Algirdas%20Mekys"> Algirdas Mekys</a>, <a href="https://publications.waset.org/abstracts/search?q=Tadas%20Malinauskas"> Tadas Malinauskas</a>, <a href="https://publications.waset.org/abstracts/search?q=Dominykas%20Augulis"> Dominykas Augulis</a>, <a href="https://publications.waset.org/abstracts/search?q=Liudvikas%20Subacius"> Liudvikas Subacius</a>, <a href="https://publications.waset.org/abstracts/search?q=Kuo-Chih%20Lee"> Kuo-Chih Lee</a>, <a href="https://publications.waset.org/abstracts/search?q=Jevgenijs%20Kaupuzs"> Jevgenijs Kaupuzs</a>, <a href="https://publications.waset.org/abstracts/search?q=Arturs%20Medvids"> Arturs Medvids</a>, <a href="https://publications.waset.org/abstracts/search?q=Hung%20Hsiang%20Cheng"> Hung Hsiang Cheng </a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this study, we focused on the optoelectronic properties of the photodiodes prepared by using 200 nm thick Ge₀.₉₅Sn₀.₀₅ epitaxial layers on Ge/n-Si substrate with aluminum contacts. Photodiodes were formed on non-irradiated and Nd: YAG laser irradiated Ge₀.₉₅Sn₀.₀₅ layers. The samples were irradiated by pulsed Nd: YAG laser with 136.7-462.6 MW/cm² intensity. The photodiodes were characterized by using short laser pulses with the wavelength in the 2.0-2.6 μm range. The laser-irradiated diode was found more sensitive in the long-wavelength range due to laser-induced Sn atoms redistribution providing formation of graded bandgap structure. Sub-millisecond photocurrent relaxation in the diodes revealed their suitability for image sensors. Our findings open the perspective for improving the photo-sensitivity of GeSn alloys in the mid-infrared by pulsed laser processing. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=GeSn" title="GeSn">GeSn</a>, <a href="https://publications.waset.org/abstracts/search?q=laser%20processing" title=" laser processing"> laser processing</a>, <a href="https://publications.waset.org/abstracts/search?q=photodetector" title=" photodetector"> photodetector</a>, <a href="https://publications.waset.org/abstracts/search?q=infrared" title=" infrared"> infrared</a> </p> <a href="https://publications.waset.org/abstracts/131848/laser-irradiated-gesn-photodetector-for-improved-infrared-photodetection" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/131848.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">153</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">20306</span> Particle Dust Layer Density and the Optical Wavelength Absorption Relationship in Photovoltaic Module</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=M.%20Mesrouk">M. Mesrouk</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Hadj%20Arab"> A. Hadj Arab </a> </p> <p class="card-text"><strong>Abstract:</strong></p> This work allows highlight the effect of dust on the absorption of the optical spectrum on the photovoltaic module, the effect of the particles dust presence on the photovoltaic modules have been a microscopic scale studied with COMSOL Multi-physic software simulation. In this paper, we have supposed the dust layer as a diffraction network repetitive optical structure characterized by the spacing between particle which represented by 'd' and the simulated structure (air-dust particle-glass). In this study we can observe the relationship between the wavelength and the particle spacing, the simulation shows us that the maximum wavelength transmission value corresponding, λ0 = 400nm, which represent the spacing value between the particles dust, d = 400 nm. In fact, we can observe that while increase dust layer density the wavelength transmission value decrease, there is a relationship between the density and wavelength value which can be absorbed in a dusty photovoltaic panel. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=dust%20effect" title="dust effect">dust effect</a>, <a href="https://publications.waset.org/abstracts/search?q=photovoltaic%20module" title=" photovoltaic module"> photovoltaic module</a>, <a href="https://publications.waset.org/abstracts/search?q=spectral%20absorption" title=" spectral absorption"> spectral absorption</a>, <a href="https://publications.waset.org/abstracts/search?q=wavelength%20transmission" title=" wavelength transmission"> wavelength transmission</a> </p> <a href="https://publications.waset.org/abstracts/30291/particle-dust-layer-density-and-the-optical-wavelength-absorption-relationship-in-photovoltaic-module" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/30291.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">463</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">20305</span> Optimization of Laser Doping Selective Emitter for Silicon Solar Cells</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Meziani%20Samir">Meziani Samir</a>, <a href="https://publications.waset.org/abstracts/search?q=Moussi%20Abderrahmane"> Moussi Abderrahmane</a>, <a href="https://publications.waset.org/abstracts/search?q=Chaouchi%20Sofiane"> Chaouchi Sofiane</a>, <a href="https://publications.waset.org/abstracts/search?q=Guendouzi%20Awatif"> Guendouzi Awatif</a>, <a href="https://publications.waset.org/abstracts/search?q=Djema%20Oussama"> Djema Oussama</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Laser doping has a large potential for integration into silicon solar cell technologies. The ability to process local, heavily diffused regions in a self-aligned manner can greatly simplify processing sequences for the fabrication of selective emitter. The choice of laser parameters for a laser doping process with 532nm is investigated. Solid state lasers with different power and speed were used for laser doping. In this work, the aim is the formation of selective emitter solar cells with a reduced number of technological steps. In order to have a highly doped localized emitter region, we used a 532 nm laser doping. Note that this region will receive the metallization of the Ag grid by screen printing. For this, we use SOLIDWORKS software to design a single type of pattern for square silicon cells. Sheet resistances, phosphorus doping concentration and silicon bulk lifetimes of irradiated samples are presented. Additionally, secondary ion mass spectroscopy (SIMS) profiles of the laser processed samples were acquired. Scanning electron microscope and optical microscope images of laser processed surfaces at different parameters are shown and compared. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=laser%20doping" title="laser doping">laser doping</a>, <a href="https://publications.waset.org/abstracts/search?q=selective%20emitter" title=" selective emitter"> selective emitter</a>, <a href="https://publications.waset.org/abstracts/search?q=silicon" title=" silicon"> silicon</a>, <a href="https://publications.waset.org/abstracts/search?q=solar%20cells" title=" solar cells"> solar cells</a> </p> <a href="https://publications.waset.org/abstracts/165841/optimization-of-laser-doping-selective-emitter-for-silicon-solar-cells" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/165841.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">102</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">20304</span> Multi-Wavelength Q-Switched Erbium-Doped Fiber Laser with Photonic Crystal Fiber and Multi-Walled Carbon Nanotubes</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Zian%20Cheak%20Tiu">Zian Cheak Tiu</a>, <a href="https://publications.waset.org/abstracts/search?q=Harith%20Ahmad"> Harith Ahmad</a>, <a href="https://publications.waset.org/abstracts/search?q=Sulaiman%20Wadi%20Harun"> Sulaiman Wadi Harun</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A simple multi-wavelength passively Q-switched Erbium-doped fiber laser (EDFL) is demonstrated using low cost multi-walled carbon nanotubes (MWCNTs) based saturable absorber (SA), which is prepared using polyvinyl alcohol (PVA) as a host polymer. The multi-wavelength operation is achieved based on nonlinear polarization rotation (NPR) effect by incorporating 50 m long photonic crystal fiber (PCF) in the ring cavity. The EDFL produces a stable multi-wavelength comb spectrum for more than 14 lines with a fixed spacing of 0.48 nm. The laser also demonstrates a stable pulse train with the repetition rate increases from 14.9 kHz to 25.4 kHz as the pump power increases from the threshold power of 69.0 mW to the maximum pump power of 133.8 mW. The minimum pulse width of 4.4 µs was obtained at the maximum pump power of 133.8 mW while the highest energy of 0.74 nJ was obtained at pump power of 69.0 mW. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=multi-wavelength%20Q-switched" title="multi-wavelength Q-switched">multi-wavelength Q-switched</a>, <a href="https://publications.waset.org/abstracts/search?q=multi-walled%20carbon%20nanotube" title=" multi-walled carbon nanotube"> multi-walled carbon nanotube</a>, <a href="https://publications.waset.org/abstracts/search?q=photonic%20crystal%20fiber" title=" photonic crystal fiber"> photonic crystal fiber</a> </p> <a href="https://publications.waset.org/abstracts/8270/multi-wavelength-q-switched-erbium-doped-fiber-laser-with-photonic-crystal-fiber-and-multi-walled-carbon-nanotubes" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/8270.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">535</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">20303</span> Optimum Er: YAG Laser Parameters for Orthodontic Composite Debonding: An in vitro Study</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mohammad%20Zamzam">Mohammad Zamzam</a>, <a href="https://publications.waset.org/abstracts/search?q=Wesam%20Bachir"> Wesam Bachir</a>, <a href="https://publications.waset.org/abstracts/search?q=Imad%20Asaad"> Imad Asaad </a> </p> <p class="card-text"><strong>Abstract:</strong></p> Several studies have produced estimates of Er:YAG laser parameters and specifications but there is still insufficient data for reliable selection of laser parameters. As a consequence, there is a heightened need for ideal specifications of Er:YAG laser to reduce the amount of enamel ablation. The objective of this paper is to investigate the influence of Er:YAG laser parameters, energy level and pulse duration, on orthodontic composite removal after bracket debonding. The sample consisted of 45 cuboids of orthodontic composite made by plastic moulds. The samples were divided into three groups, each was irradiated with Er:YAG laser set at different energy levels and three values for pulse durations (50 µs, 100 µs, and 300 µs). Geometrical parameters (depth and area) of cavities formed by laser irradiation were determined. ANCOVA test showed statistically significant difference (p < 0.0.5) between the groups indicating a potential effect of laser pulse duration on the geometrical parameters after controlling laser energy level. A post-hoc Bonferroni test ranked the 50µ Er:YAG laser pulse as the most influential factor for all geometrical parameters in removing remnant composite from enamel surface. Also, 300 mJ laser pulses caused the largest removal of the composite. The results of the present study demonstrated the efficacy of 50 µs and 300 mJ Er:YAG laser pulse for removal of remnant orthodontic composite. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=enamel" title="enamel">enamel</a>, <a href="https://publications.waset.org/abstracts/search?q=Er%3AYAG" title=" Er:YAG"> Er:YAG</a>, <a href="https://publications.waset.org/abstracts/search?q=geometrical%20parameters" title=" geometrical parameters"> geometrical parameters</a>, <a href="https://publications.waset.org/abstracts/search?q=orthodontic%20composite" title=" orthodontic composite"> orthodontic composite</a>, <a href="https://publications.waset.org/abstracts/search?q=remnant%20composite" title=" remnant composite"> remnant composite</a> </p> <a href="https://publications.waset.org/abstracts/6666/optimum-er-yag-laser-parameters-for-orthodontic-composite-debonding-an-in-vitro-study" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/6666.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">555</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">20302</span> A Tunable Long-Cavity Passive Mode-Locked Fiber Laser Based on Nonlinear Amplifier Loop Mirror</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Pinghe%20Wang">Pinghe Wang</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this paper, we demonstrate a tunable long-cavity passive mode-locked fiber laser. The mode locker is a nonlinear amplifying loop mirror (NALM). The cavity frequency of the laser is 465 kHz because that 404m SMF is inserted in the cavity. A tunable bandpass filter with ~1nm 3dB bandwidth is inserted into the cavity to realize tunable mode locking. The passive mode-locked laser at a fixed wavelength is investigated in detail. The experimental results indicate that the laser operates in dissipative soliton resonance (DSR) region. When the pump power is 400mW, the laser generates the rectangular pulses with 10.58 ns pulse duration, 70.28nJ single-pulse energy. When the pump power is 400mW, the laser keeps stable mode locking status in the range from 1523.4nm to 1575nm. During the whole tuning range, the SNR, the pulse duration, the output power and single pulse energy have a little fluctuation because that the gain of the EDF changes with the wavelength. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=fiber%20laser" title="fiber laser">fiber laser</a>, <a href="https://publications.waset.org/abstracts/search?q=dissipative%20soliton%20resonance" title=" dissipative soliton resonance"> dissipative soliton resonance</a>, <a href="https://publications.waset.org/abstracts/search?q=mode%20locking" title=" mode locking"> mode locking</a>, <a href="https://publications.waset.org/abstracts/search?q=tunable" title=" tunable"> tunable</a> </p> <a href="https://publications.waset.org/abstracts/78191/a-tunable-long-cavity-passive-mode-locked-fiber-laser-based-on-nonlinear-amplifier-loop-mirror" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/78191.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">237</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">20301</span> Comparison of Yb and Tm-Fiber Laser Cutting Processes of Fiber Reinforced Plastics</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Oktay%20Celenk">Oktay Celenk</a>, <a href="https://publications.waset.org/abstracts/search?q=Ugur%20Karanfil"> Ugur Karanfil</a>, <a href="https://publications.waset.org/abstracts/search?q=Iskender%20Demir"> Iskender Demir</a>, <a href="https://publications.waset.org/abstracts/search?q=Samir%20Lamrini"> Samir Lamrini</a>, <a href="https://publications.waset.org/abstracts/search?q=Jorg%20Neumann"> Jorg Neumann</a>, <a href="https://publications.waset.org/abstracts/search?q=Arif%20Demir"> Arif Demir</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Due to its favourable material characteristics, fiber reinforced plastics are amongst the main topics of all actual lightweight construction megatrends. Especially in transportation trends ranging from aeronautics over the automotive industry to naval transportation (yachts, cruise liners) the expected economic and environmental impact is huge. In naval transportation components like yacht bodies, antenna masts, decorative structures like deck lamps, light houses and pool areas represent cheap and robust solutions. Commercially available laser tools like carbon dioxide gas lasers (CO₂), frequency tripled solid state UV lasers, and Neodymium-YAG (Nd:YAG) lasers can be used. These tools have emission wavelengths of 10 µm, 0.355 µm, and 1.064 µm, respectively. The scientific goal is first of all the generation of a parameter matrix for laser processing of each used material for a Tm-fiber laser system (wavelength 2 µm). These parameters are the heat affected zone, process gas pressure, work piece feed velocity, intensity, irradiation time etc. The results are compared with results obtained with well-known material processing lasers, such as a Yb-fiber lasers (wavelength 1 µm). Compared to the CO₂-laser, the Tm-laser offers essential advantages for future laser processes like cutting, welding, ablating for repair and drilling in composite part manufacturing (components of cruise liners, marine pipelines). Some of these are the possibility of beam delivery in a standard fused silica fiber which enables hand guided processing, eye safety which results from the wavelength, excellent beam quality and brilliance due to the fiber nature. There is one more feature that is economically absolutely important for boat, automotive and military projects manufacturing that the wavelength of 2 µm is highly absorbed by the plastic matrix and thus enables selective removal of it for repair procedures. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Thulium%20%28Tm%29%20fiber%20laser" title="Thulium (Tm) fiber laser">Thulium (Tm) fiber laser</a>, <a href="https://publications.waset.org/abstracts/search?q=laser%20processing%20of%20fiber-reinforced%20plastics%20%28FRP%29" title=" laser processing of fiber-reinforced plastics (FRP)"> laser processing of fiber-reinforced plastics (FRP)</a>, <a href="https://publications.waset.org/abstracts/search?q=composite" title=" composite"> composite</a>, <a href="https://publications.waset.org/abstracts/search?q=heat%20affected%20zone" title=" heat affected zone"> heat affected zone</a> </p> <a href="https://publications.waset.org/abstracts/85008/comparison-of-yb-and-tm-fiber-laser-cutting-processes-of-fiber-reinforced-plastics" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/85008.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">193</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">20300</span> Investigating the Energy Gap and Wavelength of (AlₓGa₁₋ₓAs)ₘ/(GaAs)ₙ Superlattices in Terms of Material Thickness and Al Mole Fraction Using Empirical Tight-Binding Method</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Matineh%20Sadat%20Hosseini%20Gheidari">Matineh Sadat Hosseini Gheidari</a>, <a href="https://publications.waset.org/abstracts/search?q=Vahid%20Reza%20Yazdanpanah"> Vahid Reza Yazdanpanah</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this paper, we used the empirical tight-binding method (ETBM) with sp3s* approximation and considering the first nearest neighbor with spin-orbit interactions in order to model superlattice structure (SLS) of (AlₓGa₁₋ₓAs)ₘ/(GaAs)ₙ grown on GaAs (100) substrate at 300K. In the next step, we investigated the behavior of the energy gap and wavelength of this superlattice in terms of different thicknesses of core materials and Al mole fractions. As a result of this survey, we found out that as the Al composition increases, the energy gap of this superlattice has an upward trend and ranges from 1.42-1.63 eV. Also, according to the wavelength range that we gained from this superlattice in different Al mole fractions and various thicknesses, we can find a suitable semiconductor for a special light-emitting diode (LED) application. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=energy%20gap" title="energy gap">energy gap</a>, <a href="https://publications.waset.org/abstracts/search?q=empirical%20tight-binding%20method" title=" empirical tight-binding method"> empirical tight-binding method</a>, <a href="https://publications.waset.org/abstracts/search?q=light-emitting%20diode" title=" light-emitting diode"> light-emitting diode</a>, <a href="https://publications.waset.org/abstracts/search?q=superlattice" title=" superlattice"> superlattice</a>, <a href="https://publications.waset.org/abstracts/search?q=wavelength" title=" wavelength"> wavelength</a> </p> <a href="https://publications.waset.org/abstracts/134686/investigating-the-energy-gap-and-wavelength-of-alga1asgaas-superlattices-in-terms-of-material-thickness-and-al-mole-fraction-using-empirical-tight-binding-method" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/134686.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">211</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">20299</span> Solution of Singularly Perturbed Differential Difference Equations Using Liouville Green Transformation</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Y.%20N.%20Reddy">Y. N. Reddy</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The class of differential-difference equations which have characteristics of both classes, i.e., delay/advance and singularly perturbed behaviour is known as singularly perturbed differential-difference equations. The expression ‘positive shift’ and ‘negative shift’ are also used for ‘advance’ and ‘delay’ respectively. In general, an ordinary differential equation in which the highest order derivative is multiplied by a small positive parameter and containing at least one delay/advance is known as singularly perturbed differential-difference equation. Singularly perturbed differential-difference equations arise in the modelling of various practical phenomena in bioscience, engineering, control theory, specifically in variational problems, in describing the human pupil-light reflex, in a variety of models for physiological processes or diseases and first exit time problems in the modelling of the determination of expected time for the generation of action potential in nerve cells by random synaptic inputs in dendrites. In this paper, we envisage the use of Liouville Green Transformation to find the solution of singularly perturbed differential difference equations. First, using Taylor series, the given singularly perturbed differential difference equation is approximated by an asymptotically equivalent singularly perturbation problem. Then the Liouville Green Transformation is applied to get the solution. Several model examples are solved, and the results are compared with other methods. It is observed that the present method gives better approximate solutions. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=difference%20equations" title="difference equations">difference equations</a>, <a href="https://publications.waset.org/abstracts/search?q=differential%20equations" title=" differential equations"> differential equations</a>, <a href="https://publications.waset.org/abstracts/search?q=singular%20perturbations" title=" singular perturbations"> singular perturbations</a>, <a href="https://publications.waset.org/abstracts/search?q=boundary%20layer" title=" boundary layer"> boundary layer</a> </p> <a href="https://publications.waset.org/abstracts/86176/solution-of-singularly-perturbed-differential-difference-equations-using-liouville-green-transformation" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/86176.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">200</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">20298</span> Numerical Investigation of the Transverse Instability in Radiation Pressure Acceleration</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=F.%20Q.%20Shao">F. Q. Shao</a>, <a href="https://publications.waset.org/abstracts/search?q=W.%20Q.%20Wang"> W. Q. Wang</a>, <a href="https://publications.waset.org/abstracts/search?q=Y.%20Yin"> Y. Yin</a>, <a href="https://publications.waset.org/abstracts/search?q=T.%20P.%20Yu"> T. P. Yu</a>, <a href="https://publications.waset.org/abstracts/search?q=D.%20B.%20Zou"> D. B. Zou</a>, <a href="https://publications.waset.org/abstracts/search?q=J.%20M.%20Ouyang"> J. M. Ouyang</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The Radiation Pressure Acceleration (RPA) mechanism is very promising in laser-driven ion acceleration because of high laser-ion energy conversion efficiency. Although some experiments have shown the characteristics of RPA, the energy of ions is quite limited. The ion energy obtained in experiments is only several MeV/u, which is much lower than theoretical prediction. One possible limiting factor is the transverse instability incited in the RPA process. The transverse instability is basically considered as the Rayleigh-Taylor (RT) instability, which is a kind of interfacial instability and occurs when a light fluid pushes against a heavy fluid. Multi-dimensional particle-in-cell (PIC) simulations show that the onset of transverse instability will destroy the acceleration process and broaden the energy spectrum of fast ions during the RPA dominant ion acceleration processes. The evidence of the RT instability driven by radiation pressure has been observed in a laser-foil interaction experiment in a typical RPA regime, and the dominant scale of RT instability is close to the laser wavelength. The development of transverse instability in the radiation-pressure-acceleration dominant laser-foil interaction is numerically examined by two-dimensional particle-in-cell simulations. When a laser interacts with a foil with modulated surface, the internal instability is quickly incited and it develops. The linear growth and saturation of the transverse instability are observed, and the growth rate is numerically diagnosed. In order to optimize interaction parameters, a method of information entropy is put forward to describe the chaotic degree of the transverse instability. With moderate modulation, the transverse instability shows a low chaotic degree and a quasi-monoenergetic proton beam is produced. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=information%20entropy" title="information entropy">information entropy</a>, <a href="https://publications.waset.org/abstracts/search?q=radiation%20pressure%20acceleration" title=" radiation pressure acceleration"> radiation pressure acceleration</a>, <a href="https://publications.waset.org/abstracts/search?q=Rayleigh-Taylor%20instability" title=" Rayleigh-Taylor instability"> Rayleigh-Taylor instability</a>, <a href="https://publications.waset.org/abstracts/search?q=transverse%20instability" title=" transverse instability"> transverse instability</a> </p> <a href="https://publications.waset.org/abstracts/46130/numerical-investigation-of-the-transverse-instability-in-radiation-pressure-acceleration" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/46130.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">346</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">20297</span> Powerful Laser Diode Matrixes for Active Vision Systems</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Dzmitry%20M.%20Kabanau">Dzmitry M. Kabanau</a>, <a href="https://publications.waset.org/abstracts/search?q=Vladimir%20V.%20Kabanov"> Vladimir V. Kabanov</a>, <a href="https://publications.waset.org/abstracts/search?q=Yahor%20V.%20Lebiadok"> Yahor V. Lebiadok</a>, <a href="https://publications.waset.org/abstracts/search?q=Denis%20V.%20Shabrov"> Denis V. Shabrov</a>, <a href="https://publications.waset.org/abstracts/search?q=Pavel%20V.%20Shpak"> Pavel V. Shpak</a>, <a href="https://publications.waset.org/abstracts/search?q=Gevork%20T.%20Mikaelyan"> Gevork T. Mikaelyan</a>, <a href="https://publications.waset.org/abstracts/search?q=Alexandr%20P.%20Bunichev"> Alexandr P. Bunichev</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This article is deal with the experimental investigations of the laser diode matrixes (LDM) based on the AlGaAs/GaAs heterostructures (lasing wavelength 790-880 nm) to find optimal LDM parameters for active vision systems. In particular, the dependence of LDM radiation pulse power on the pulse duration and LDA active layer heating as well as the LDM radiation divergence are discussed. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=active%20vision%20systems" title="active vision systems">active vision systems</a>, <a href="https://publications.waset.org/abstracts/search?q=laser%20diode%20matrixes" title=" laser diode matrixes"> laser diode matrixes</a>, <a href="https://publications.waset.org/abstracts/search?q=thermal%20properties" title=" thermal properties"> thermal properties</a>, <a href="https://publications.waset.org/abstracts/search?q=radiation%20divergence" title=" radiation divergence"> radiation divergence</a> </p> <a href="https://publications.waset.org/abstracts/19451/powerful-laser-diode-matrixes-for-active-vision-systems" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/19451.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">613</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">20296</span> Wavelength Conversion of Dispersion Managed Solitons at 100 Gbps through Semiconductor Optical Amplifier</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Kadam%20Bhambri">Kadam Bhambri</a>, <a href="https://publications.waset.org/abstracts/search?q=Neena%20Gupta"> Neena Gupta</a> </p> <p class="card-text"><strong>Abstract:</strong></p> All optical wavelength conversion is essential in present day optical networks for transparent interoperability, contention resolution, and wavelength routing. The incorporation of all optical wavelength convertors leads to better utilization of the network resources and hence improves the efficiency of optical networks. Wavelength convertors that can work with Dispersion Managed (DM) solitons are attractive due to their superior transmission capabilities. In this paper, wavelength conversion for dispersion managed soliton signals was demonstrated at 100 Gbps through semiconductor optical amplifier and an optical filter. The wavelength conversion was achieved for a 1550 nm input signal to1555nm output signal. The output signal was measured in terms of BER, Q factor and system margin.     <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=all%20optical%20wavelength%20conversion" title="all optical wavelength conversion">all optical wavelength conversion</a>, <a href="https://publications.waset.org/abstracts/search?q=dispersion%20managed%20solitons" title=" dispersion managed solitons"> dispersion managed solitons</a>, <a href="https://publications.waset.org/abstracts/search?q=semiconductor%20optical%20amplifier" title=" semiconductor optical amplifier"> semiconductor optical amplifier</a>, <a href="https://publications.waset.org/abstracts/search?q=cross%20gain%20modultation" title=" cross gain modultation"> cross gain modultation</a> </p> <a href="https://publications.waset.org/abstracts/46267/wavelength-conversion-of-dispersion-managed-solitons-at-100-gbps-through-semiconductor-optical-amplifier" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/46267.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">455</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">20295</span> Preparation and Sealing of Polymer Microchannels Using EB Lithography and Laser Welding</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Ian%20Jones">Ian Jones</a>, <a href="https://publications.waset.org/abstracts/search?q=Jonathan%20Griffiths"> Jonathan Griffiths</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Laser welding offers the potential for making very precise joints in plastics products, both in terms of the joint location and the amount of heating applied. These methods have allowed the production of complex products such as microfluidic devices where channels and structure resolution below 100 µm is regularly used. However, to date, the dimension of welds made using lasers has been limited by the focus spot size that is achievable from the laser source. Theoretically, the minimum spot size possible from a laser is comparable to the wavelength of the radiation emitted. Practically, with reasonable focal length optics the spot size achievable is a few factors larger than this, and the melt zone in a plastics weld is larger again than this. The narrowest welds feasible to date have therefore been 10-20 µm wide using a near-infrared laser source. The aim of this work was to prepare laser absorber tracks and channels less than 10 µm wide in PMMA thermoplastic using EB lithography followed by sealing of channels using laser welding to carry out welds with widths of the order of 1 µm, below the resolution limit of the near-infrared laser used. Welded joints with a width of 1 µm have been achieved as well as channels with a width of 5 µm. The procedure was based on the principle of transmission laser welding using a thin coating of infrared absorbent material at the joint interface. The coating was patterned using electron-beam lithography to obtain the required resolution in a reproducible manner and that resolution was retained after the transmission laser welding process. The joint strength was ratified using larger scale samples. The results demonstrate that plastics products could be made with a high density of structure with resolution below 1 um, and that welding can be applied without excessively heating regions beyond the weld lines. This may be applied to smaller scale sensor and analysis chips, micro-bio and chemical reactors and to microelectronic packaging. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=microchannels" title="microchannels">microchannels</a>, <a href="https://publications.waset.org/abstracts/search?q=polymer" title=" polymer"> polymer</a>, <a href="https://publications.waset.org/abstracts/search?q=EB%20lithography" title=" EB lithography"> EB lithography</a>, <a href="https://publications.waset.org/abstracts/search?q=laser%20welding" title=" laser welding"> laser welding</a> </p> <a href="https://publications.waset.org/abstracts/7851/preparation-and-sealing-of-polymer-microchannels-using-eb-lithography-and-laser-welding" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/7851.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">402</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">20294</span> Submicron Laser-Induced Dot, Ripple and Wrinkle Structures and Their Applications</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=P.%20Slepicka">P. Slepicka</a>, <a href="https://publications.waset.org/abstracts/search?q=N.%20Slepickova%20Kasalkova"> N. Slepickova Kasalkova</a>, <a href="https://publications.waset.org/abstracts/search?q=I.%20Michaljanicova"> I. Michaljanicova</a>, <a href="https://publications.waset.org/abstracts/search?q=O.%20Nedela"> O. Nedela</a>, <a href="https://publications.waset.org/abstracts/search?q=Z.%20Kolska"> Z. Kolska</a>, <a href="https://publications.waset.org/abstracts/search?q=V.%20Svorcik"> V. Svorcik</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Polymers exposed to laser or plasma treatment or modified with different wet methods which enable the introduction of nanoparticles or biologically active species, such as amino-acids, may find many applications both as biocompatible or anti-bacterial materials or on the contrary, can be applied for a decrease in the number of cells on the treated surface which opens application in single cell units. For the experiments, two types of materials were chosen, a representative of non-biodegradable polymers, polyethersulphone (PES) and polyhydroxybutyrate (PHB) as biodegradable material. Exposure of solid substrate to laser well below the ablation threshold can lead to formation of various surface structures. The ripples have a period roughly comparable to the wavelength of the incident laser radiation, and their dimensions depend on many factors, such as chemical composition of the polymer substrate, laser wavelength and the angle of incidence. On the contrary, biopolymers may significantly change their surface roughness and thus influence cell compatibility. The focus was on the surface treatment of PES and PHB by pulse excimer KrF laser with wavelength of 248 nm. The changes of physicochemical properties, surface morphology, surface chemistry and ablation of exposed polymers were studied both for PES and PHB. Several analytical methods involving atomic force microscopy, gravimetry, scanning electron microscopy and others were used for the analysis of the treated surface. It was found that the combination of certain input parameters leads not only to the formation of optimal narrow pattern, but to the combination of a ripple and a wrinkle-like structure, which could be an optimal candidate for cell attachment. The interaction of different types of cells and their interactions with the laser exposed surface were studied. It was found that laser treatment contributes as a major factor for wettability/contact angle change. The combination of optimal laser energy and pulse number was used for the construction of a surface with an anti-cellular response. Due to the simple laser treatment, we were able to prepare a biopolymer surface with higher roughness and thus significantly influence the area of growth of different types of cells (U-2 OS cells). <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=cell%20response" title="cell response">cell response</a>, <a href="https://publications.waset.org/abstracts/search?q=excimer%20laser" title=" excimer laser"> excimer laser</a>, <a href="https://publications.waset.org/abstracts/search?q=polymer%20treatment" title=" polymer treatment"> polymer treatment</a>, <a href="https://publications.waset.org/abstracts/search?q=periodic%20pattern" title=" periodic pattern"> periodic pattern</a>, <a href="https://publications.waset.org/abstracts/search?q=surface%20morphology" title=" surface morphology"> surface morphology</a> </p> <a href="https://publications.waset.org/abstracts/60306/submicron-laser-induced-dot-ripple-and-wrinkle-structures-and-their-applications" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/60306.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">237</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">20293</span> Generation of ZnO-Au Nanocomposite in Water Using Pulsed Laser Irradiation</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Elmira%20Solati">Elmira Solati</a>, <a href="https://publications.waset.org/abstracts/search?q=Atousa%20Mehrani"> Atousa Mehrani</a>, <a href="https://publications.waset.org/abstracts/search?q=Davoud%20Dorranian"> Davoud Dorranian</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Generation of ZnO-Au nanocomposite under laser irradiation of a mixture of the ZnO and Au colloidal suspensions are experimentally investigated. In this work, firstly ZnO and Au nanoparticles are prepared by pulsed laser ablation of the corresponding metals in water using the 1064 nm wavelength of Nd:YAG laser. In a second step, the produced ZnO and Au colloidal suspensions were mixed in different volumetric ratio and irradiated using the second harmonic of a Nd:YAG laser operating at 532 nm wavelength. The changes in the size of the nanostructure and optical properties of the ZnO-Au nanocomposite are studied as a function of the volumetric ratio of ZnO and Au colloidal suspensions. The crystalline structure of the ZnO-Au nanocomposites was analyzed by X-ray diffraction (XRD). The optical properties of the samples were examined at room temperature by a UV-Vis-NIR absorption spectrophotometer. Transmission electron microscopy (TEM) was done by placing a drop of the concentrated suspension on a carbon-coated copper grid. To further confirm the morphology of ZnO-Au nanocomposites, we performed Scanning electron microscopy (SEM) analysis. Room temperature photoluminescence (PL) of the ZnO-Au nanocomposites was measured to characterize the luminescence properties of the ZnO-Au nanocomposites. The ZnO-Au nanocomposites were characterized by Fourier transform infrared (FTIR) spectroscopy. The X-ray diffraction pattern shows that the ZnO-Au nanocomposites had the polycrystalline structure of Au. The behavior observed by images of transmission electron microscope reveals that soldering of Au and ZnO nanoparticles include their adhesion. The plasmon peak in ZnO-Au nanocomposites was red-shifted and broadened in comparison with pure Au nanoparticles. By using the Tauc’s equation, the band gap energy for ZnO-Au nanocomposites is calculated to be 3.15–3.27 eV. In this work, the formation of ZnO-Au nanocomposites shifts the FTIR peak of metal oxide bands to higher wavenumbers. PL spectra of the ZnO-Au nanocomposites show that several weak peaks in the ultraviolet region and several relatively strong peaks in the visible region. SEM image indicates that the morphology of ZnO-Au nanocomposites produced in water was spherical. The TEM images of ZnO-Au nanocomposites demonstrate that with increasing the volumetric ratio of Au colloidal suspension the adhesion increased. According to the size distribution graphs of ZnO-Au nanocomposites with increasing the volumetric ratio of Au colloidal suspension the amount of ZnO-Au nanocomposites with the smaller size is further. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Au%20nanoparticles" title="Au nanoparticles">Au nanoparticles</a>, <a href="https://publications.waset.org/abstracts/search?q=pulsed%20laser%20ablation" title=" pulsed laser ablation"> pulsed laser ablation</a>, <a href="https://publications.waset.org/abstracts/search?q=ZnO-Au%20nanocomposites" title=" ZnO-Au nanocomposites"> ZnO-Au nanocomposites</a>, <a href="https://publications.waset.org/abstracts/search?q=ZnO%20nanoparticles" title=" ZnO nanoparticles"> ZnO nanoparticles</a> </p> <a href="https://publications.waset.org/abstracts/36793/generation-of-zno-au-nanocomposite-in-water-using-pulsed-laser-irradiation" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/36793.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">346</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">20292</span> Short-Path Near-Infrared Laser Detection of Environmental Gases by Wavelength-Modulation Spectroscopy</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Isao%20Tomita">Isao Tomita</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The detection of environmental gases, 12CO_2, 13CO_2, and CH_4, using near-infrared semiconductor lasers with a short laser path length is studied by means of wavelength-modulation spectroscopy. The developed system is compact and has high sensitivity enough to detect the absorption peaks of isotopic 13CO_2 of a 3-% CO_2 gas at 2 um with a path length of 2.4 m, where its peak size is two orders of magnitude smaller than that of the ordinary 12CO_2 peaks. In addition, the detection of 12CO_2 peaks of a 385-ppm (0.0385-%) CO_2 gas in the air is made at 2 um with a path length of 1.4 m. Furthermore, in pursuing the detection of an ancient environmental CH_4 gas confined to a bubble in ice at the polar regions, measurements of the absorption spectrum for a trace gas of CH_4 in a small area are attempted. For a 100-% CH_4 gas trapped in a 1 mm^3 glass container, the absorption peaks of CH_4 are obtained at 1.65 um with a path length of 3 mm, and also the gas pressure is extrapolated from the measured data. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=environmental%20gases" title="environmental gases">environmental gases</a>, <a href="https://publications.waset.org/abstracts/search?q=Near-Infrared%20Laser%20Detection" title=" Near-Infrared Laser Detection"> Near-Infrared Laser Detection</a>, <a href="https://publications.waset.org/abstracts/search?q=Wavelength-Modulation%20Spectroscopy" title=" Wavelength-Modulation Spectroscopy"> Wavelength-Modulation Spectroscopy</a>, <a href="https://publications.waset.org/abstracts/search?q=gas%20pressure" title=" gas pressure"> gas pressure</a> </p> <a href="https://publications.waset.org/abstracts/15017/short-path-near-infrared-laser-detection-of-environmental-gases-by-wavelength-modulation-spectroscopy" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/15017.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">423</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">20291</span> Spectral Responses of the Laser Generated Coal Aerosol</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Tibor%20Ajtai">Tibor Ajtai</a>, <a href="https://publications.waset.org/abstracts/search?q=No%C3%A9mi%20Utry"> Noémi Utry</a>, <a href="https://publications.waset.org/abstracts/search?q=M%C3%A1t%C3%A9%20Pint%C3%A9r"> Máté Pintér</a>, <a href="https://publications.waset.org/abstracts/search?q=Tomi%20Smausz"> Tomi Smausz</a>, <a href="https://publications.waset.org/abstracts/search?q=Zolt%C3%A1n%20K%C3%B3nya"> Zoltán Kónya</a>, <a href="https://publications.waset.org/abstracts/search?q=B%C3%A9la%20Hopp"> Béla Hopp</a>, <a href="https://publications.waset.org/abstracts/search?q=G%C3%A1bor%20Szab%C3%B3"> Gábor Szabó</a>, <a href="https://publications.waset.org/abstracts/search?q=Zolt%C3%A1n%20Boz%C3%B3ki"> Zoltán Bozóki</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Characterization of spectral responses of light absorbing carbonaceous particulate matter (LAC) is of great importance in both modelling its climate effect and interpreting remote sensing measurement data. The residential or domestic combustion of coal is one of the dominant LAC constituent. According to some related assessments the residential coal burning account for roughly half of anthropogenic BC emitted from fossil fuel burning. Despite of its significance in climate the comprehensive investigation of optical properties of residential coal aerosol is really limited in the literature. There are many reason of that starting from the difficulties associated with the controlled burning conditions of the fuel, through the lack of detailed supplementary proximate and ultimate chemical analysis enforced, the interpretation of the measured optical data, ending with many analytical and methodological difficulties regarding the in-situ measurement of coal aerosol spectral responses. Since the gas matrix of ambient can significantly mask the physicochemical characteristics of the generated coal aerosol the accurate and controlled generation of residential coal particulates is one of the most actual issues in this research area. Most of the laboratory imitation of residential coal combustion is simply based on coal burning in stove with ambient air support allowing one to measure only the apparent spectral feature of the particulates. However, the recently introduced methodology based on a laser ablation of solid coal target opens up novel possibilities to model the real combustion procedure under well controlled laboratory conditions and makes the investigation of the inherent optical properties also possible. Most of the methodology for spectral characterization of LAC is based on transmission measurement made of filter accumulated aerosol or deduced indirectly from parallel measurements of scattering and extinction coefficient using free floating sampling. In the former one the accuracy while in the latter one the sensitivity are liming the applicability of this approaches. Although the scientific community are at the common platform that aerosol-phase PhotoAcoustic Spectroscopy (PAS) is the only method for precise and accurate determination of light absorption by LAC, the PAS based instrumentation for spectral characterization of absorption has only been recently introduced. In this study, the investigation of the inherent, spectral features of laser generated and chemically characterized residential coal aerosols are demonstrated. The experimental set-up and its characteristic for residential coal aerosol generation are introduced here. The optical absorption and the scattering coefficients as well as their wavelength dependency are determined by our state-of-the-art multi wavelength PAS instrument (4λ-PAS) and multi wavelength cosinus sensor (Aurora 3000). The quantified wavelength dependency (AAE and SAE) are deduced from the measured data. Finally, some correlation between the proximate and ultimate chemical as well as the measured or deduced optical parameters are also revealed. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=absorption" title="absorption">absorption</a>, <a href="https://publications.waset.org/abstracts/search?q=scattering" title=" scattering"> scattering</a>, <a href="https://publications.waset.org/abstracts/search?q=residential%20coal" title=" residential coal"> residential coal</a>, <a href="https://publications.waset.org/abstracts/search?q=aerosol%20generation%20by%20laser%20ablation" title=" aerosol generation by laser ablation"> aerosol generation by laser ablation</a> </p> <a href="https://publications.waset.org/abstracts/40409/spectral-responses-of-the-laser-generated-coal-aerosol" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/40409.pdf" target="_blank" class="btn btn-primary 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