Добірка наукової літератури з теми "Laser cascade quantique"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся зі списками актуальних статей, книг, дисертацій, тез та інших наукових джерел на тему "Laser cascade quantique".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Статті в журналах з теми "Laser cascade quantique":
Carras, Mathieu. "Comprendre. Les lasers à cascade quantique : vers la démocratisation !" Photoniques, no. 93 (September 2018): 44–48. http://dx.doi.org/10.1051/photon/20189344.
-Normand, E. "Les lasers à cascade quantique et leurs applications." Revue de l'Electricité et de l'Electronique -, no. 09 (2002): 36. http://dx.doi.org/10.3845/ree.2002.097.
Marcadet, Xavier, Mathieu Carras, Grégory Maisons, Guy-Maël De Naurois, and Bouzid Simozrag. "Les lasers à cascade quantique : l’accès au moyen infrarouge." Photoniques, no. 54 (July 2011): 54–57. http://dx.doi.org/10.1051/photon/20115454.
Subran, Costel, Michael Radunsky, and Michael Henson. "Lasers à cascade quantique dans les applications militaires modernes." Photoniques, no. 55 (September 2011): 52–55. http://dx.doi.org/10.1051/photon/20115552.
VASANELLI, Angela, and Carlo SIRTORI. "Lasers à cascade quantique." Optique Photonique, August 2019. http://dx.doi.org/10.51257/a-v1-e6470.
Дисертації з теми "Laser cascade quantique":
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.
Grouiez, Bruno Parvitte Bertrand Zéninari Virginie. "Applications des lasers à cascade quantique pulsés à l'étude de l'atmosphère." Reims : S.C.D. de l'Université, 2008. http://scdurca.univ-reims.fr/exl-doc/GED00000980.pdf.
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.
Grouiez, Bruno. "Applications des lasers à cascade quantique pulsés à l’étude de l’atmosphère." Reims, 2008. http://www.theses.fr/2008REIMS025.
This thesis work presents atmospheric applications using Quantum Cascade lasers (QCL) emitting in mid-Infrared. Parts I & II present the context of my thesis work, the principle of QCL and the study of _1 band of SO2 around 9 μm by continuous wave operation QCL. In the third part, we present the first method we have employed to command the laser which is also the most popular in pulsed operation. This one consists of operating the laser with a short pulse duration (_ 10 ns). This method has been applied to the study of NH3 and has put in evidence many troubles which limit considerably the interest in spectroscopic applications. In the fourth part, the command of QCL using long pulses (> 500 ns) is presented. We demonstrate the possibility to record an intra-pulse spectrum in about one microsecond. This technic has been applied to the study of SO2 in 9 μm region and the results have been compared with results obtained by continuous wave operation. The conclusion of our previous works (in parts III & IV) drove us to consider a third way with intermediatesize pulse width (< 100 ns). This is presented in the fifth part. This method has solved many troubles of this kind of laser and furthermore it has put into the light the most importants points about "rapid passage" effects
Jumpertz, Louise. "Photonique non-linéaire dans les lasers à cascade quantique moyen infrarouges." Electronic Thesis or Diss., Paris, ENST, 2016. https://pastel.hal.science/tel-03689516.
Mid-infrared quantum cascade lasers are unipolar semiconductor lasers, which have become widely used sources for applications such as gas spectroscopy, free-space communications or optical countermeasures. Applying external per-turbations such as optical feedback or optical injection leads to a strong modification of the quantum cascade laser prop-erties. Optical feedback impacts the static properties of mid-infrared Fabry-Perot and distributed feedback quantum cas-cade lasers, inducing power increase, threshold reduction, modification of the optical spectrum, which can become either single- or multimode, and enhanced beam quality of broad-area transverse multimode lasers. It also leads to a different dynamical behavior, and a quantum cascade laser subject to optical feedback can oscillate periodically or even become chaotic: this work provides the very first analysis of optical instabilities in the mid-infrared range. A numerical study of optical injection furthermore proves that quantum cascade lasers can injection-lock over a few gigahertz, where they should experience enhanced stability and especially improved modulation bandwidth. Furthermore, some promising dynamics appear outside the locking range with periodic oscillations at a tunable frequency or high-intensity events. A quantum cascade laser under external control could therefore be a source with enhanced properties for the usual mid-infrared applications, but could also address new applications such as tunable photonic oscillators, extreme events gen-erators, chaotic LIDAR, chaos-based secured communications or unpredictable countermeasures
Le, Biavan Nolwenn. "Vers un laser à cascade quantique à base d’oxyde de zinc." Thesis, Université Côte d'Azur (ComUE), 2019. http://www.theses.fr/2019AZUR4070.
The Terahertz domain (THz), situated between the visible and microwave energy range, turns out to be very promissing in terms of applications. However its application potential is not fully used because of the lack for compact sources able to cover a large part of its energy range. Quantum Cascade Lasers (QCL) are good candidates for this purpose, because there are both compact and highly tunable. But in the THz range, the existing QCLs suffer from the operation temperature limitation ( 200K ), which is very restricting from the application viewpoint. It comes from an intrinsic property of the materials commonly used to build QCLs: the LO-phonon energy. As a consequence a strong competition between the LO-phonon transition and the QCL radiative transition arise at room temperature, which hinder the lasing efficiency. To tackle this issue, we choose to make use of ZnO, because its LO-phonon energy is twice larger compared to the aforementioned materials, thus enabling to keep the lasing action efficient at room temperature. Even if ZnO and its related alloys are not new in the field of semiconductor science, they are totally exotic for the QCL field. Indeed, QCL are built from highly periodic heterostructures, from which all the key device properties come from. Therefore, the heterostructure should be controlled at the monolayer scale and this precision should be reproducible on hundred of periods, which made QCL growth an indubitabble challenge. This thesis aims at take up this challenge by bringing ZnO/(Zn, Mg)O heterostructures to this ultime degree of control. We are growing ZnO/(Zn, Mg)O heterostructures on ZnO substrates with a new molecular beam epitaxy system and we demonstrate that the heterostructures quality matche the QCL material requirements. This first step enables us to demonstrate the observation of intersubband transitions in the mid-infrared range until room temperature, as well as their coupling within asymmetric quantum well structures. Complete cascade structures were also grown and lead to the first demonstration of a ZnO based Quantum Cascade Detector in the infrared range until room temperature. QCL structures were also grown and shows very good heterostructure control as stated by scanning transmission electron microscopy experiments
Mammez, Marie-Hélène. "Détection hétérodyne de molécules d'intérêt atmosphérique à l'aide de lasers à cascade quantique." Thesis, Reims, 2016. http://www.theses.fr/2016REIMS027/document.
Infrared heterodyne sensing is a technique which has been developed primarily toimprove the detectivity of infrared detectors, particularly in the 8 − 12 μm window. This technique has long been closely associated with the use of gas lasers. The fields of application were mainly astrophysical and atmospheric studies. Due to the complexity of implementation and the size of this type of instrument, ew other applications could have been envisaged. Recent progress in the field of semiconductor lasers (Quantum Cascade Laser - QCL - cover a large part of the infrared spectrum) enable to consider new developments and new applications for infrared heterodyne sensing, for example for the remote detection and identification of atmospheric molecules, such as pollutants. The main advantages of heterodyne sensing concern spectral and directional selectivity of the instrument. It is applicable in civil sector to atmospheric molecules such as ozone and carbon dioxide, and for the military one to detect hazardous species. A heterodyne receiver has been developed with a QCL emitting at around 10 μm and a temperature stabilized black body. To this end, several systems were considered: a system based on lens, another one based on off-axis parabolic mirrors and a last one based on mid-infrared optical fibers. Meanwhile, a heliostat has also been developed in order to do atmospheric measurements
Loghmari, Zeineb. "Lasers à cascades quantiques InAs / AISb au-delà de 10µm : émission mono-fréquence et génération du THz par différence de fréquences." Thesis, Montpellier, 2019. http://www.theses.fr/2019MONTS088.
Applications such as gas spectroscopy or medical imaging require light sources emitting in the mid- and far infrared (10 µm<λ < 28 µm) as well as in the THz (λ > 60µm). High-performance, continuous wave regime (CW) and single-frequency emission components are essential for this type of application. Quantum cascade lasers (QCLs) are the only sources that can cover this wide range of wavelengths thanks to their inter-sub-band transitions. However, the performance of LCQs in this wavelength range is often limited by non-radiative transitions. The latter generate mechanisms such as photon absorption by TO phonons or electron relaxation by LO phonons. As a result, laser emission in CW and at room temperature becomes particularly difficult. The objective of this thesis is the development of InAs/AlSb LCQs above 10 µm for single-frequency emission and THz generation by frequency difference. A key point in this work is the use of the InAs/AlSb material system. Their advantage is based on the low effective mass. It is 0.023m0 for InAs compared to 0.041m0 for InGaAs and 0.067m0 in GaAs.First, the development of LCQ active regions based on InAs/AlSb emitting at 11µm was carried out. This work made it possible to produce single-frequency DFB sources emitting continuously at 295K and which were used in QEPAS spectroscopy for ethylene sensing. This LCQ has also been transferred to Silicon (Si) substrate. He has demonstrated the world's most efficient LCQ grown directly on Si substrate. The wavelength range ≥ 11µm was also explored. First, by using a dielectric waveguide where this study leads to an active region design at 20µm whose performances exceed the state of the art in the world with continuous operation up to 240K. Then, these technologies were also exploited by using metal-metal waveguides. In this part, the limits of this waveguide were tested. This made it possible to produce a dual-frequency DFB CQL with a metal-metal waveguide emitting two wavelengths in the far infrared for the generation of THz by difference frequency. In this context, the non-linearity of this type of active region has been optimized. The extraction of the THz wave was also studied
Mammez, Dominique. "Détection de molécules gazeuses d’intérêt atmosphérique par spectrométrie infrarouge avec laser à cascade quantique largement accordable." Thesis, Reims, 2013. http://www.theses.fr/2013REIMS003/document.
As the study of the atmosphere is growing strongly in response to environmental issues, the needs in terms of laser sources for spectroscopy of complex molecules require the development of widely tunable sources. The PhD work presented in this manuscript is focused on the implementation of quantum cascade lasers in external cavity (EC-QCL). Part of this work deals with the characterization of a commercial EC-QCL source and its application to gas detection by photoacoustic spectrometry. Measurements were performed on carbon dioxide in exhaled air and butane. The central part of this thesis consists in the development of ECQCL sources based on quantum cascade laser chips from III-V Lab. The aim is to obtain widely tunable sources that can be used for the detection of complex molecules. This includes simulation, design and implementation of external cavity systems. Two EC-QCL sources were implemented. The first one is a pulsed laser emitting around 4,5μm. The second one emits around 7,5μm and is operated at room temperature in continuous wave mode. This laser was used to record the spectra of acetone and phosphoryl chloride
Gilles, Clément. "Optique intégrée pour sources largement accordables moyen-infrarouge." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS009/document.
In the mid-infrared, arrays of distributed feedback quantum cascade lasers have been developed as a serious alternative to obtain extended wavelength operation range of laser-based gas sensing systems. Narrow-linewidth, single mode operation and wide tunability are then gathered together on a single chip with high compactness and intrinsic stability. In order to benefit from this extended wavelength range in a single output beam, the key challenge resides in the combination of different technologies to merge the output of different sources via the use of mid-IR photonic integrated circuits (PIC). The PIC can be split into three main blocks: the passive waveguide platform, the beam combiner and the active/passive coupler. For beam handling and guiding, we report fabrication and characterization of deeply etched InP/InGaAs/InP waveguides with state of the art performances. We fabricate and characterize multiplexers based on echelle and arrayed waveguide gratings on InP and SiGe platforms. A 60-to-1 spectral multiplexer operating in the 7-to-8.5 µm range is demonstrated. An advanced multiplexing scheme using interleaved and cross-order operations is also exposed. Finally, we realize quantum cascade laser arrays on InP and silicon. We design, fabricate and characterize an adiabatic coupler to efficiently and monolithically integrate active and passive waveguides. Heterogenous and hybrid integration are also considered with the demonstration of a tunable source using laser array and InP-based multiplexer