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Tesis sobre el tema "Lasers à Cascade Interbande"

Autor: Grafiati

Publicado: 1 de junio de 2024

Última modificación: 31 de julio de 2025

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1

Zhao, Shiyuan. "Noise, Dynamics and Squeezed Light in Quantum Dot and Interband Cascade Lasers." Electronic Thesis or Diss., Institut polytechnique de Paris, 2023. http://www.theses.fr/2023IPPAT044.

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Les lasers à semiconducteurs sont devenus omniprésents aussi bien dans la recherche scientifique que dans les applications en ingénierie, et leur miniaturisation a fait d'importants progrès depuis leur première démonstration en 1960. Deux avancées majeures dans ce domaine incluent les lasers à boîtes quantiques (QD), qui opèrent dans la plage de longueurs d'onde proche de l'infrarouge, et les lasers à cascade interbande (ICL), conçus pour une utilisation dans le moyen infrarouge. Dans le paysage actuel de l'optoélectronique, les circuits intégrés photoniques (CIP) jouent un rôle essentiel et é

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2

Fordyce, Jordan. "Single-mode interband cascade lasers for petrochemical process monitoring." Electronic Thesis or Diss., Université de Montpellier (2022-....), 2023. http://www.theses.fr/2023UMONS070.

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Les lasers à cascade interbandes (ICL) fournissent des sources pour la gamme spectrale du moyen infrarouge compris entre 3 et 6 µm particulièrement efficaces en termes de consommation d’énergie. Cette gamme spectrale est particulièrement intéressante pour la détection des gaz impliqués dans l’industrie pétrochimique, car des gaz tels que le méthane, l'éthane et le dioxyde de carbone présentent une forte absorption dans cette gamme de longueur d’onde. L'identification correcte d'un gaz présent dans un échantillon nécessite des lasers avec une émission monomode et une certaine accordabilité en l

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3

O'Hagan, Seamus. "Multi-mode absorption spectroscopy for multi-species and multi-parameter sensing." Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:6f422683-7c50-47dd-8824-56b4b4ea941d.

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The extension of Multi-mode Absorption Spectroscopy (MUMAS) to the infra-red spectral region for multi-species gas sensing is reported. A computationally efficient, theoretical model for analysis of MUMAS spectra is presented that avoids approximations used in previous work and treats arbitrary and time-dependent spectral intensity envelopes, thus facilitating the use of commercially available Interband Cascade Lasers (ICLs) and Quantum Cascade Lasers (QCLs). The first use of an ICL for MUMAS is reported using a multi-mode device operating at 3.7 μm to detect CH<sub>4</sub> transitions over

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4

Ikyo, Achakpa Barnabas. "Physical properties of interband and interband cascade edge- and surface-emitting mid-infrared lasers." Thesis, University of Surrey, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.549457.

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5

Abajyan, Pavel. "Génération et contrôle de peignes de fréquences optiques dans les lasers à cascade d'interbande (ICL)." Electronic Thesis or Diss., Sorbonne université, 2024. http://www.theses.fr/2024SORUS024.

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Les peignes de fréquence optique (OFC) sont des sources de lumière cohérente qui émettent un large spectre de modes discrets parfaitement espacés, chacun avec une fréquence absolue mesurable avec la précision d'une horloge atomique.Les OFC dans l'infrarouge moyen (MIR 3-12 μm) sont récemment devenus d'un grand intérêt pour la spectroscopie moléculaire par la présence de forte absorption des modes de vibration et de rotation moléculaires dans la région des "empreintes digitales" spectroscopiques. Néanmoins, le fonctionnement de l'OFC dans la région cruciale de l'infrarouge moyen (MWIR 3-6 μm) r

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6

Herdt, Andreas Verfasser], Wolfgang [Akademischer Betreuer] Elsäßer, and Thomas [Akademischer Betreuer] [Walther. "The laser-as-detector approach exploiting mid-infrared emitting interband cascade lasers: A potential for spectroscopy and communication applications / Andreas Herdt ; Wolfgang Elsäßer, Thomas Walther." Darmstadt : Universitäts- und Landesbibliothek, 2020. http://d-nb.info/1224048725/34.

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7

Herdt, Andreas [Verfasser], Wolfgang [Akademischer Betreuer] Elsäßer, and Thomas [Akademischer Betreuer] Walther. "The laser-as-detector approach exploiting mid-infrared emitting interband cascade lasers: A potential for spectroscopy and communication applications / Andreas Herdt ; Wolfgang Elsäßer, Thomas Walther." Darmstadt : Universitäts- und Landesbibliothek, 2020. http://d-nb.info/1224048725/34.

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8

Patterson, Steven Gregory. "Bipolar cascade lasers." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/8805.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.<br>Includes bibliographical references.<br>This thesis addresses issues of the design and modeling of the Bipolar Cascade Laser (BCL), a new type of quantum well laser. BCLs consist of multiple single stage lasers electrically coupled via tunnel junctions. The BCL ideally operates by having each injected electron participate in a recombination event in the topmost active region, then tunnel from the valence band of the first active region into the conduction band of the next activ

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9

Williams, Benjamin S. (Benjamin Stanford) 1974. "Terahertz quantum cascade lasers." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/17012.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2003.<br>Includes bibliographical references (p. 297-310).<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>The development of the terahertz frequency range has long been impeded by the relative dearth of compact, coherent radiation sources of reasonable power. This thesis details the development of quantum cascade lasers (QCLs) that operate in the terahertz with photon energies belo

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10

Rochat, Michel. "Far-infrared quantum cascade lasers." Online version, 2002. http://bibpurl.oclc.org/web/24095.

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11

Dhirhe, Devnath. "Monolithic tuneable quantum cascade lasers." Thesis, University of Glasgow, 2013. http://theses.gla.ac.uk/4604/.

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This thesis is concerned with the design, fabrication and characterisation of monolithic tuneable quantum cascade lasers (QCLs), which are suitable for tuneable diode laser based absorption spectroscopy and polarisation dependent spectroscopy in the mid-infrared wavelength range. All investigations and device development work were carried out using the QCL structure based on strain-compensated Ga0.331In0.669As/Al0.659In0.341As grown on an InP substrate that emits light around 4500 nm wavelength. To make the QCLs electrically tuned, two laser designs were investigated: the double ring quantum c

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12

bin, Hashim Hasnul Hidayat. "Travelling-wave series cascade lasers." Thesis, University of Leeds, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.493548.

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A travelling-wave microwave fibre-optic hnk (TWMFL) is proposed consisting of two transmission line structures that are periodically loaded with laser diodes and photodiodes, connected to one another by a fibre array.

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13

Commin, James Paul. "Short wavelength quantum cascade lasers." Thesis, University of Sheffield, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.575411.

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Quantum Cascade Lasers (QCLs) are unipolar lasers based on intersubband transitions that have emission wavelengths in the mid- to far-infrared. Mid-infrared QCLs have recently reached a high level of technological maturity with watt level continuous wave output powers being demonstrated at room temperature. However, the performance of these conventional QCLs falls away very rapidly below -4 urn where a number of important applications exist. This thesis details the design, fabrication and characterisation of high performance 'short wavelength' QCLs that operate in the 3-4 urn region. The high

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14

Freeman, J. R. "Heterogeneous terahertz quantum cascade lasers." Thesis, University of Cambridge, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.599209.

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Although terahertz quantum cascade lasers (QCLs) are promising devices for cheap, compact and coherent sources of terahertz radiation, the full potential of these lasers has not been realised. In this work we shall examine the active region design of THz QCLs and study the behaviour of heterogeneous active regions, where there are several quantum cascade designs combined in the same active region. We will present a study of the systematic design of THz QCLs and show that it is possible to systematically tune the frequency of these devices by simple modifications to the active region design. We

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15

Kischkat, Jan-Ferenc. "External Cavity Quantum Cascade Lasers." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2015. http://dx.doi.org/10.18452/17303.

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Diese Arbeit untersucht den Einfluss verschiedener physikalischer Parameter auf das Verhalten von Frequenz-abstimmbaren External-Cavity Quantenkaskadenlasern (EC-QCLs) theoretisch und experimentell. Diese beinhalten unter anderen die Antireflexschicht, die Art der Optiken, die geometrischen und die mechanisch/strukturellen Eigenschaften. Dies wurde erreicht durch Aufbau dreier sehr unterschiedlicher EC-Konfigurationen, der Diskussion und dem Vergleich ihrer Leistungsmerkmale und ihrer Vor- und Nachteile für verschiedene Anwendungen unter hauptsächlicher Verwendung von QCLs desselben Wafers de

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16

Flores, Yuri Victorovich. "Mid-infrared quantum cascade lasers." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2015. http://dx.doi.org/10.18452/17224.

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Quantenkaskadenlaser (QCLs) wurden vor gerade zwanzig Jahren erfunden und haben seitdem stetig im weltweiten Markt der optoelektronischen Bauelemente für den Infrarot an Bedeutung gewonnen. Anwendungsbeispiele für aktuelle und potenzielle Einsatzgebiete von QCLs sind photoakustische Spektroskopie, Umweltüberwachung, Simulation von heißen Körpern, und optische Freiraumdatenübertragung. Rekord optische Leistungen von 14 W und Leistungseffizienzen zwischen 15-35 % wurden bei mittelinfraroten QCLs für Betriebstemperaturen zwischen 80-300 K erreicht. Die weitere Verbesserung dieser Eigenschaften hä

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17

Hay, Kenneth Gillespie. "Gas sensing using quantum cascade lasers." Thesis, University of Strathclyde, 2010. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=12766.

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18

Houghton, M. "Gain in terahertz quantum cascade lasers." Thesis, University of Cambridge, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.604257.

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This thesis focuses on experiments involving coupled cavity THz QCLs. These take the form of either monolithic devices with etched gaps to form two cavities on the same device, or separate devices aligned under vacuum and at cryogenic temperatures using a specially built piezo-electric micropositioner system. After an introductory chapter briefly reviewing the current state of QCL research, processing techniques and other standard experimental techniques, the thesis begins with the presentation of some experiments dealing with the effects of optical feedback between the two cavities. This lead

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19

Kumar, Sushil Ph D. Massachusetts Institute of Technology. "Development of terahertz quantum-cascade lasers." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/40501.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2007.<br>Includes bibliographical references (p. 321-340).<br>The terahertz or the far-infrared frequency range of the electromagnetic spectrum ( ... ) has historically been technologically underdeveloped despite having many potential applications, primarily due to lack of suitable sources of coherent radiation. Following on the remarkable development of mid-infrared ( ... ) quantum-cascade lasers (QCLs) in the past decade, this thesis describes the development of electrically-pumped t

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20

Han, Ningren. "Electrically tunable terahertz quantum cascade lasers." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/84723.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2013.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (pages 113-118).<br>In this thesis, microelectromechanical systems (MEMS) assisted electrically tunable terahertz quantum cascade lasers (THz QCLs) are designed and demonstrated. Two MEMS tuner devices are proposed to achieve electrically

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21

Worrall, Christopher Henry. "Long wavelength Terahertz quantum cascade lasers." Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612926.

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22

Gambari, Johannes. "Nonlinear effects in quantum cascade lasers." Thesis, Imperial College London, 2011. http://hdl.handle.net/10044/1/7824.

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23

Kundu, Iman. "Frequency tunable terahertz quantum cascade lasers." Thesis, University of Leeds, 2014. http://etheses.whiterose.ac.uk/7890/.

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Terahertz (THz) quantum cascade lasers (QCLs) are compact solid–state sources of coheren radiation operating in the far–infrared (FIR) range of the electromagnetic spectrum. THz QCL ridge waveguides are typically Fabry–Pérot (FP) cavities and exhibit characteristic multiple–mode emission. However, widely tunable single–mode (SM) THz QCLs are ideally suited to many THz-sensing applications, such as trace gas detection, atmospheric observations and security screening. Tunable THz QCLs are also highly desirable for techniques like heterodyne mixing and self–mixing interferometry. SM emission from

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24

Fujita, Kazuue. "Mid-infrared InGaAs/InAlAs Quantum Cascade Lasers." 京都大学 (Kyoto University), 2014. http://hdl.handle.net/2433/192129.

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25

Devenson, Jan. "InAs/AlSb short wavelength quantum cascade lasers." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2010. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20101102_153710-37964.

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Application of InAs/AlSb materials system for development of short-wavelength quantum cascade lasers is explored. Molecular beam epitaxy (MBE) technology allowing to grow multiperiodical unstrained InAs/AlSb heterostructures with roughness of 1-2 monolayers is developed. It is demonstrated that InAs/AlSb materials system is well-suitable for development of short-wavelength quantum cascade lasers operating below 4 µm wavelength. Lasers containing plasmon-enhanced waveguides as well as the short period InAs/AlSb superlattices as waveguides were designed, MBE-grown and studied. The effect of wave

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26

Zervos, Charalampos. "Non-linear optics in quantum cascade lasers." Thesis, Imperial College London, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.429194.

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27

Mc, Tavish James Peter. "Band Structure Effects in Quantum cascade Lasers." Thesis, University of Leeds, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.503285.

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28

Bloom, Guillaume. "Combinaison cohérente de lasers à cascade quantique." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00678958.

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Des applications comme les contre-mesures optiques nécessitent des sources puissantes et avec une bonne qualité de faisceau dans le moyen infrarouge. Le laser à cascade quantique (LCQ) est une solution prometteuse mais la puissance fournie par ces lasers n'est pas suffisante. La combinaison cohérente de plusieurs de ces sources devrait permettre de sommer leurs puissances tout en conservant la qualité de faisceau d'un émetteur unique et constitue donc une solution intéressante pour contourner l'actuelle limitation en puissance des LCQ.Nous présentons une étude théorique et expérimentale de la

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29

Carder, Damian Andrew. "Studies of GaAs based quantum cascade lasers." Thesis, University of Sheffield, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.275215.

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30

Burghoff, David Patrick. "Characterization of mid-infrared quantum cascade lasers." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/55343.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2009.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (p. 97-99).<br>Quantum cascade lasers provide some of the highest output powers available for light in the mid-infrared range (from 3 to 8 m). As many of their applications require portability, designs that have a high wall-plug efficienc

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31

Alton, Jesse. "Bound-to-continuum THz quantum cascade lasers." Thesis, University of Cambridge, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.615160.

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32

Wilson, David. "Trace gas spectrometry using quantum cascade lasers." Thesis, University of Strathclyde, 2012. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=18580.

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This project was initially the continuation of a previous PhD students work. This changed slightly to incorporate the initial steps of development of a new system. However the main underlying focus was the absorption of infrared light by molecular gases using a still relatively new light source. This thesis will present the results of experimental work carried out during studies on the detection of gases and the nonlinear optical effects that arise from the absorption of light from a rapid frequency swept laser. A bench mounted two channel quantum cascade laser absorption spectrometer was used

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33

Matsuoka, Yohei. "Broadly Tunable External Cavity Quantum Cascade Lasers." Doctoral thesis, Humboldt-Universität zu Berlin, 2020. http://dx.doi.org/10.18452/21073.

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Mitt-Infrarot-Technologie (mid-IR) ist ein äußerst leistungsfähiges Werkzeug für die Anwendung in der Molekülspektroskopie, da die Schwingungsmoden vieler Moleküle in diesem Wellenlängenbereich liegen. Der Quantenkaskadenlaser mit externem Resonator (EC-QCL) kann alle Bereiche dieses Spektrums abdecken. Das Hauptanliegen dieser Arbeit ist die Verbesserung der Leistung des EC-QCL im Hinblick auf die Breite des Wellenlängen-Durchstimmbereichs und die Laserleistung. Theoretische Untersuchungen bestätigen zunächst, dass der QCL die Schlüsselrolle bei EC-Systemen einnimmt: Die Effizienz des EC wird

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34

Kirkbride, James M. R. "Coherent transient spectroscopy with quantum cascade lasers." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:c7b897e5-052f-4c15-a3c9-f95ca3b56d70.

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This thesis is concerned with coherent effects in high resolution mid-infrared gas phase spectroscopy using quantum cascade lasers (QCLs). An introductory chapter explains the importance of QCLs as radiation sources in the mid-infrared region of the spectrum and goes on to detail their development and structure. A discussion of coherent effects in spectroscopy follows, leading into the second chapter which discusses the theories relevant to the experimental sections of the thesis. In chapter 2 the theory underpinning direct and velocity selective, Doppler-free spectroscopy is discussed and a d

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35

Keeley, James Thomas. "Self-mixing in terahertz quantum cascade lasers." Thesis, University of Leeds, 2016. http://etheses.whiterose.ac.uk/12509/.

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Terahertz (THz) quantum cascade lasers (QCL) have stimulated significant interest in THz laser imaging systems due to their compact size, broad spectral coverage (~1.2-5.2 THz) and high output power ( > 1 W). Due to their continuous wave (CW) narrowband emission and quantum noise limited linewidths, THz QCLs are particularly suited to coherent detection, but the majority of previously reported imaging systems have employed incoherent detection. Furthermore THz detectors typically fall into one of two categories (thermal or electrical), both of which have downsides (slow response rate or limite

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36

Friart, Gaetan. "Semiconductor laser dynamics: two polarization feedback, quantum cascade lasers, and ring lasers." Doctoral thesis, Universite Libre de Bruxelles, 2017. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/248835.

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Semiconductor lasers (Sls) are very sensitive to external perturbations which may destabilize their steady output. This is particularly striking when the SL is subject to optical feedback, i.e. when part of the light coming out of the laser is reinjected in the cavity after reflection from a distant mirror. For some applications, this is a nuisance that we wish to avoid. But optical feedback may also drive the laser into dynamical regimes which are useful for new applications. In this thesis, we study different problems where an SL is subject to a delayed feedback or to an injected signal. The

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37

Wang, Cheng. "Modulation dynamics of InP-based quantum dot lasers and quantum cascade lasers." Thesis, Rennes, INSA, 2015. http://www.theses.fr/2015ISAR0009/document.

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Le besoin incessant de débits toujours plus élevés dans les systèmes de télécommunications a un impact sur tous les éléments composant la chaine de transmission. Ainsi, pour faire face à l’augmentation croissante du volume de données échangées à travers le monde, le développement de nouvelles sources optiques semi-conductrices est absolument nécessaire. La modulation directe de lasers nanostructurés constitue une alternative bas coût et à faible consommation énergétique qui permettra de remplacer progressivement les diodes lasers à puits quantiques actuelles. De nombreux efforts en recherche o

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38

Chassagneux, Yannick. "Photonique pour les lasers à cascade quantique térahertz." Phd thesis, Université Paris Sud - Paris XI, 2009. http://tel.archives-ouvertes.fr/tel-00740111.

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Situées entre l'infrarouge et les micro-ondes, les ondes dites "terahertz" (THz) ont les propriétés de passer aussi bien à travers la peau et les vêtements que les papiers, le bois, le carton ou encore le plastique. Autant d'atouts qui permettent d'envisager de multiples applications dans les secteurs de l'imagerie médicale, de la spectroscopie, de la sécurité et de l'environnement. D'où l'intérêt que suscitent les lasers à cascade quantique terahertz, une récente famille de lasers semi-conducteurs qui émettent à des fréquences de l'ordre du terahertz. Pourtant, s'ils sont aujourd'hui les seul

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39

Charlton, Christy. "Quantum Cascade Lasers for Mid-Infrared Chemical Sensing." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/13953.

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The mid-infrared (MIR) spectral range (2-20 m) is particularly useful for chemical sensing due to the excitation of fundamental rotational and vibrational modes. In the fingerprint region (10-20 m), most organic analytes have unique absorption patterns; absorption measurements in this region provide molecule-specific information with high sensitivity. Quantum cascade lasers (QCLs) present an ideal light source for (MIR) chemical sensing due to their narrow linewidth, high spectral density, compact size, and ease of fabrication of nearly any MIR wavelength. As the emission wavelength is depe

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40

Bai, Jing. "Optimization of Optical Nonlinearities in Quantum Cascade Lasers." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19797.

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Nonlinearities in quantum cascade lasers (QCL¡¯s) have wide applications in wavelength tunability and ultra-short pulse generation. In this thesis, optical nonlinearities in InGaAs/AlInAs-based mid-infrared (MIR) QCL¡¯s with quadruple resonant levels are investigated. Design optimization for the second-harmonic generation (SHG) of the device is presented. Performance characteristics associated with the third-order nonlinearities are also analyzed. The design optimization for SHG efficiency is obtained utilizing techniques from supersymmetric quantum mechanics (SUSYQM) with both material-dep

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41

Soulby, Michael Richard. "Mid-infrared spectroscopic studies of quantum cascade lasers." Thesis, University of Sheffield, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.527223.

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42

Qin, Qi Ph D. Massachusetts Institute of Technology. "Development of tunable terahertz quantum cascade wire lasers." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/78548.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2012.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 179-188).<br>For a long time, terahertz (THz) radiation has been of great interest to scientific community because of its spectroscopic and imaging applications based on its unique properties, such as the capabilities to penetrate many materials which are opaque in other frequency range (e.g. packaging, plastics, paints and semiconductors), and spectroscopic signatures of many important materials.

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43

Atkins, Chris. "New developments in GaAs-based quantum cascade lasers." Thesis, University of Sheffield, 2013. http://etheses.whiterose.ac.uk/5105/.

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This thesis presents a study of the design and optimisation of gallium-arsenide-based quantum cascade lasers (QCLs). Traditionally, the optical and electrical performance of these devices has been inferior in comparison to QCLs that are based on the InP material system, due mainly to the limitations imposed on performance by the intrinsic material properties of GaAs. In an attempt to improve the performance of GaAs QCLs, indium-gallium-phosphide and indium-aluminium-phosphide have been used as the waveguide cladding layers in several new QCL designs. These two materials combine low waveguide l

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Wang, Feihu. "Ultrafast terahertz pulse generation from quantum cascade lasers." Electronic Thesis or Diss., Paris 6, 2016. http://www.theses.fr/2016PA066752.

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Lasers à cascades quantiques (LCQs) THz sont des dispositifs à semi-conducteurs fondamentaux pour l'action du laser dans la gamme THz. Des évolutions considérables ont été réalisées dans la dernière décennie en termes de fonctionnement de la température et de la puissance de sortie. LCQs THz peuvent posséder de bandes spectrales très larges, les rendant approprié pour la génération d'impulsions THz ultracourtes par blocage de mode. Cependant, à ce jour, la génération d'impulsions THz de LCQ a été limitée à 10 - 20 ps, en dépit de plusieurs années d'efforts de recherche. Dans cette thèse, ce go

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Vaitiekus, Deivis. "Development of quantum cascade lasers for gas sensing applications." Thesis, University of Sheffield, 2015. http://etheses.whiterose.ac.uk/13916/.

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Quantum cascade lasers (QCLs) are capable of high power, tunable wavelength and single mode emission at room temperature in the mid-infrared wavelength region. These capabilities make them perfect light sources for laser based gas spectroscopy. The work described in this thesis focuses on development of QCLs suitable for selective gas sensing applications. The thesis starts with the description of different changes to the QCL active region design. These changes were studied in order to improve laser performance while keeping the emission wavelength fixed. The proposed modifications were perfor

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Mohd, Ibrahim Mohamed Shahrizan bin. "Segmented and patterned single-metal terahertz quantum cascade lasers." Thesis, University of Leeds, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.545707.

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Laffaille, Pierre. "Lasers à cascade quantique moyen infrarouge à base d'InAs." Phd thesis, Université Montpellier II - Sciences et Techniques du Languedoc, 2013. http://tel.archives-ouvertes.fr/tel-01021281.

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Les lasers à cascade quantique sont des sources lasers à semiconducteur compactes et capables de délivrer une forte puissance optique sur une large gamme de longueur d'onde dans l'infrarouge. Les QCLs de la filière InP sont les plus établis. Le système de matériaux InAs/AlSb est une solution alternative encore peu développée mais qui, en vertu de ses propriétés, présente des atouts incontestables pour la réalisation de lasers à cascade quantique. Le travail de cette thèse a apporté une meilleure connaissance du système InAs/AlSb et de ses possibilités pour les QCLs, à la fois sur un plan théor

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Leuliet, Aude. "Simulation du transport dans les lasers à cascade quantique." Paris 7, 2010. http://www.theses.fr/2010PA077070.

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Les lasers à cascade quantique (LCQs) sont des dispositifs semiconducteurs unipolaires dont le principe de fonctionnement est basé sur des transitions électroniques dans la bande de conduction d'un système de puits quantiques et sur l'effet tunnel résonant. Ce sont les seules sources semiconductrices cohérentes de lumière de grande efficacité pour le moyen infrarouge fonctionnant l température ambiante. Leur longueur d'onde étant indépendante de l'énergie du gap du matériau utilisé, leur gamme spectrale s'étend dans l'infrarouge de 3|im à 24 \im. La thèse -dont le but est le calcul du transpor

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Storck, Joakim. "A Measurement Platform for Characterization of Quantum Cascade Lasers." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-191097.

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A measurement platform has been built to characterize quantum cascade lasers regrown at KTH by measuring their spectral and electrical properties at room temperature. Since the current source used in this work had a compliance voltage which was too low to get above threshold, an adapter was made to put an external voltage source in series with it, raising the voltage over the laser. The adapter was first simulated using OrCAD PSPICE and then soldered together and put inside a plastic box with connections for the voltage source, current source and laser mount. A software was made using LabView

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Alhathlool, Raed Hussain S. "The development and applications of terahertz quantum cascade lasers." Thesis, University of Leeds, 2014. http://etheses.whiterose.ac.uk/6421/.

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Terahertz frequency quantum cascade lasers (THz QCLs) are compact, semiconductor sources of coherent THz radiation, and have numerous potential applications in chemical sensing and industrial inspection, as well as security and biomedical imaging. In this thesis, the development of QCLs as sources of THz radiation is explored, together with their application in self-mixing (SM) imaging systems. The effect of reducing the etch depth of the THz QCL active region was explored, and its influence on QCL performance evaluated. This was aimed of improving the thermal management in QCLs, as well as op

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