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Artykuły w czasopismach na temat "Photonique dans le moyen infrarouge"
Marris-Morini, Delphine, Carlos Alonso-Ramos, Xavier Le Roux i Laurent Vivien. "La photonique silicium / germanium pour la spectroscopie moyen infrarouge". Photoniques, nr 98 (wrzesień 2019): 20–23. http://dx.doi.org/10.1051/photon/20199820.
Pełny tekst źródłaCarras, Mathieu. "Comprendre. Les lasers à cascade quantique : vers la démocratisation !" Photoniques, nr 93 (wrzesień 2018): 44–48. http://dx.doi.org/10.1051/photon/20189344.
Pełny tekst źródłaSaehr, D., D. Walter i R. Wey. "Fixation de toluène dans une montmorillonite-Cu(II)". Clay Minerals 26, nr 1 (marzec 1991): 43–48. http://dx.doi.org/10.1180/claymin.1991.026.1.05.
Pełny tekst źródłaBASTIANELLI, Denis, Laurent BONNAL, Philippe BARRE, Serge NABENEZA, Paulo SALGADO i Donato ANDUEZA. "La spectrométrie dans le proche infrarouge pour la caractérisation des ressources alimentaires". INRA Productions Animales 31, nr 3 (18.01.2019): 237–54. http://dx.doi.org/10.20870/productions-animales.2018.31.2.2330.
Pełny tekst źródłaDoré, F., A. Ballestar, C. Cornet, N. Bertru, I. Alghoraibi, R. Piron, J. Even i S. Loualiche. "Structures à îlots quantiques sur substrat InP(100) pour l'émission dans le moyen infrarouge (2-5 μm)". Journal de Physique IV (Proceedings) 135, nr 1 (październik 2006): 283–84. http://dx.doi.org/10.1051/jp4:2006135090.
Pełny tekst źródłaSANCHEZ, Marie-Pierre, Valérie WOLF, Cécile LAITHIER, Mohammed EL JABRI, Éric BEUVIER, Odile ROLET-RÉPÉCAUD, Nicolas GAUDILLIÈRE i in. "Analyse génétique de la « fromageabilité » du lait de vache prédite par spectrométrie dans le moyen infrarouge en race Montbéliarde". INRAE Productions Animales 32, nr 3 (29.11.2019): 379–98. http://dx.doi.org/10.20870/productions-animales.2019.32.3.2950.
Pełny tekst źródłaCoutelier, Clément. "Survol des méthodes d’acquisition par le drone en archéologie viaire". Aquitania : une revue inter-régionale d'archéologie 37, nr 1 (2021): 13–19. http://dx.doi.org/10.3406/aquit.2021.1632.
Pełny tekst źródłaGELÉ, M., S. MINERY, J. M. ASTRUC, P. BRUNSCHWIG, M. FERRAND-CALMELS, G. LAGRIFFOUL, H. LARROQUE i in. "Phénotypage et génotypage à grande échelle de la composition fine des laits dans les filières bovine, ovine et caprine". INRAE Productions Animales 27, nr 4 (21.10.2014): 255–68. http://dx.doi.org/10.20870/productions-animales.2014.27.4.3072.
Pełny tekst źródłaLeray, O. "Influence de l'origine géographique du lait sur la précision des dosages de matière grasse et de protéines par spectroscopie dans le moyen infrarouge". Le Lait 69, nr 6 (1989): 547–60. http://dx.doi.org/10.1051/lait:1989638.
Pełny tekst źródłaMarchane, Ahmed, Lionel Jarlan, Lahoucine Hanich i Abdelghani Boudhar. "Caractérisation de l'enneigement sur l'atlas marocain par le capteur MODIS et relation avec le climat (période 2000-2011)". Revue Française de Photogrammétrie et de Télédétection, nr 204 (8.04.2014): 13–22. http://dx.doi.org/10.52638/rfpt.2013.18.
Pełny tekst źródłaRozprawy doktorskie na temat "Photonique dans le moyen infrarouge"
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.
Pełny tekst źródłaMid-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
Dory, Jean-Baptiste. "Matériaux chalcogénures innovants pour l’optique non linéaire intégrée dans le moyen infra rouge". Thesis, Bourgogne Franche-Comté, 2019. http://www.theses.fr/2019UBFCK075.
Pełny tekst źródłaElaboration and characterization of new compositions of chalcogenide materials exhibiting nonlinear effects for integrated optic applications and fabrication of low-loss waveguides
Heidmann, Samuel. "Composants actifs en optique intégrée pour l'interférométrie stellaire dans le moyen infrarouge". Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENT096/document.
Pełny tekst źródłaThe observation of exoplanets and more generally of the close environment of young stars represents an observational double difficulty : the small angular separation between the star and the planet (or its environment such as a protoplanetary disk) and contrast flux. One technique to overcome these difficulties is the nulling interferometry. Two telescopes target a star planet/disk system and the pupils are recombined in such a way that the photons from the star cause destructive interference while those from the planet/disk cause constructive interference. Instrumental constraints are very strong to ensure sufficient extinction of the star, both in terms of optical path difference (of the order of nanometers) than photometric balance (4% for a minimum extinction ratio 40dB). L-band (3.4-4.1μm) is adapted to the observation of cold matter, because the flux ratio between the planet (or star dust) and the star presents a minimum of 10−4 order after 3μm, making the L-band particularly attractive for such observations. Because silicates and glass are not suitable to build guides reaching the L-band, there is currently no mature instrument in this band in integrated optics. Indeed, instrumental constraints on nulling interferometry can be relaxed by using a single-mode interferometer integrated, thanks to modal filtering. An interferometric instrument integrated L-band would be more than welcome, but needs a technology development effort to develop a method of producing L-band single-mode guides as well as integrated beam combiners. My PhD work was to develop such single mode waveguides as well as beam combiners in order to ob- tain an extinction ratio of 10−4 in the L-band. The selected material is lithium niobate (LiNbO3), the mid-infrared transparency makes it a perfect candidate. We used two methods to make the guides : proton exchange and Titanium diffusion. This latter allows to guide both TE and TM polarizations. As Lithium Niobate is electro-optic, we also worked to internally control the phase delay between channels without mobile mechanical part, applying an electric field at the guide via electrodes "on chip". The electro-optical effect allows us to not only vary the optical path delay between channels but also to settle the photometric balance, paving the way towards the realization of an integrated complete interferometer, lightweight, compact and robust. I therefore sought to characterize and optimize the electro-optical efficiency of the system to obtain a command voltage lower than 15V. The result is a "Y" interferometer presenting two Mach-Zehnders as input for photometric adjustment and offering an extinction ratio of 33dB in monochromatic light (3.39μm). Because the electro-optical drive is very fast (> MHz), it becomes possible to compensate for the phase perturbations induced by the atmosphere (1kHz) in real time. We have worked to build a demonstrator which compensates phase delays of the order of kHz without mechanical mobile part and which guarantees, at 3.39μm, an optical path delay around 3nm. We also realized directional couplers whose coupling ratio can be adjusted via a control voltage. The direct application of this technology is an interferometric component 2TABCD or 3TAC whose defects (unbalanced couplers) can be electrically corrected by calibration
Chastanet, Daniel. "Nouvelles sources compactes dans le moyen-infrarouge : Lasers à cascade quantique au-delà de 16 microns et LED électroluminescentes en régime de couplage fort". Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS143/document.
Pełny tekst źródłaThe far infrared (16 µm < λ < 30 µm) is an important area for applications such as detecting wide organic molecules (whose absorption fingerprints falls in this wavelength range) and for radio-astronomy (local oscillator for the heterodyne detection). Unfortunately, the atmospheric transparency window, commonly called the 4th transparency window is almost unexplored.QCL are coherent light sources, covering a range from infrared to THz, based on the engineering of band structures of semiconductors. They have excellent performances in the mid infrared but their effectiveness diminishes in the 4th window and beyond.One aim of this thesis is the development of a new generation of QCL able to cover this spectral region with good performance in terms of output power and maximum operating temperature. A key point in this context is the use of a new material system for these wavelengths: InAs / AlSb. The advantage of this solution is its very small effective mass : 0.023 m0 (compared to 0.043 m0 in the InGaAs wells), which provides a higher gain, resulting in significant performances improvement.Another fundamentally different approach lies in the strong coupling regime. Using an ultra-fast characteristic time associated with Rabi oscillations, can allow the realization of emitting sources with improved quantum efficiency (compared to an bare inter-subband transition). pseudo particles arising from the strong coupling regime in the inter-subband transitions (called polaritons inter-sub-bands) may under certain limits behave as bosons. One then sees the possibility of coherent sources based on the relaxation of a polariton condensate
Ghosh, Amar Nath. "Design, simulations et expériences de génération de supercontinuum dans l'infrarouge moyen dans des fibres à cristaux phoniques en verre souple". Thesis, Bourgogne Franche-Comté, 2020. http://www.theses.fr/2020UBFCD035.
Pełny tekst źródłaThis doctoral thesis, funded within the framework of a European Marie-Curie H2020 SUPUVIR project, focuses on the design and fabrication of new photonic crystal fibers from infrared soft glasses making it possible to produce a wide emission spectrum in the mid-infrared (IR) wavelength region through generation of supercontinuum (SC). Applications of mid-IR SC sources cover infrared spectroscopy, optical detection of chemical and molecular species, materials processing, and biomedical imaging. An alternative to conventional thermal light sources, mid-IR sources have broad spectral bandwidth like a lamp or Globar and high brightness, which is more than 20 times of the sun focussed in a small spot similar to a laser. Several optical fibers with different photonic structures and different soft glasses have been produced and studied. In collaboration with the Institute of Electronic Materials Technology in Warsaw, heavy metal-oxide glass (PBG81) microstructured fibers were first developed and with these fibers we demonstrated the efficient generation of SC from 0.89 to 2.5 µm, limited by the absorption of the glass. Then, in partnership with the University of Rennes and the Technical University of Denmark, we fabricated microstructured fibers based on chalcogenide glasses (As38Se62) with polarization-maintaining property. These fibers have made it possible to generate a linearly polarized 3.1 to 6 µm supercontinuum. SC bandwidth was further extended between 1 µm and 7.4 µm in taper fibers produced from Ge10As22Se68 glass. The laser power handling capacities of these chalcogenide fibers were also analyzed. Finally, we have developed a compact mid-IR SC system using a fiber cascade comprising of silica, fluoride, and chalcogenide fiber, pumped by a fiber laser at 1.55 µm, and making it possible to extend the emission range from 2 to 10 µm. This research work thus constitutes an important step towards the development of stable and compact fiber SC sources for various applications in the mid-infrared
Moreau, Virginie. "Etude du confinement optique dans les lasers à cascade quantique et applications à la détection". Phd thesis, Université Paris Sud - Paris XI, 2008. http://tel.archives-ouvertes.fr/tel-00350075.
Pełny tekst źródłaCe travail de thèse présente l'étude et l'optimisation du confinement optique vertical dans des hétérostructures lasers à cascade quantique épitaxiées sans couche de confinement supérieure. Ces structures sont intéressantes puisqu'elles sont adaptées à la fois au guide à plasmons de surface et au guide avec un confinement par air. En menant une étude approfondie de la répartition du mode optique et du courant électrique, nous avons conçu des structures originales qui ouvrent notamment de nouvelles perspectives sur l'utilisation de ces lasers pour la détection de fluides. Nous avons également montré que l'observation par microscopie en champ proche est un outil précieux pour la caractérisation et la compréhension des lasers à cascade quantique. Finalement, nous posons les bases nécessaires à la réalisation de matrices de lasers monomodes, utilisant la technologie des cristaux photoniques.
Viallon, Maud. "Réalisation et caractérisation de membranes polymères microstructurées capables de moduler leurs propriétés de réflexion dans le domaine du moyen infrarouge : application aux textiles pour le confort thermique". Thesis, Lille 1, 2017. http://www.theses.fr/2017LIL10105.
Pełny tekst źródłaThe goal of this thesis is the manufacturing of polymer membranes that can be complexed to a textile to improve the thermal comfort felt. They must be able to dynamically modulate their optical properties in the mid-infrared (MIR) according to the environmental conditions.The first part of this work presents the theoretical notions related to thermal comfort and both physical mechanisms hydric and thermal transfers through the textile membranes. A state of the art makes it possible to identify the existing technologies. The concept of photonic crystals and their application in the field of infrared medium are presented. This part ends with the establishment of specifications for the design of a structured polymer membrane using the principle of photonic crystals to modulate the interaction of human thermal radiation.The second part of this work describes the method of finite differences in time domain simulation (FDTD) used to predict the optical properties of micro-structured membranes as function of their geometric characteristics. A first realization in polycrystalline silicon authorizes the validation of the numerical model calibration as well as the protocol of the infrared characterization. The manufacturing process uses cleanroom technologies from microelectronics and microsystems.The last part of this work is devoted to the study by FDTD of microstructured polymer membranes from the previously calibrated 'in-silico' model. This study makes it possible to define geometrical parameters able to modulate the reflection of the infrared having a wavelength between 5 and 15 microns. A manufacturing process is developed which makes it possible to realize self-supporting structured membranes to the appropriate dimensions
Gilles, Clément. "Optique intégrée pour sources largement accordables moyen-infrarouge". Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS009/document.
Pełny tekst źródłaIn 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
Carletti, Luca. "Photonique intégrée nonlinéaire sur plate-formes CMOS compatibles pour applications du proche au moyen infrarouge". Thesis, Ecully, Ecole centrale de Lyon, 2015. http://www.theses.fr/2015ECDL0013/document.
Pełny tekst źródłaIntegrated photonics offers a vast choice of nonlinear optical phenomena that could potentially be used for realizing chip-based and cost-effective all-optical signal processing devices that can handle, in principle, optical data signals at very high bit rates. The new components and technological solutions arising from this approach could have a considerable impact for telecom and datacom applications. Nonlinear optical effects (such as the optical Kerr effect or the Raman effect) can be potentially used for realizing active devices (e.g. optical amplifiers, modulators, lasers, signal regenerators and wavelength converters). During the last decade, the silicon on insulator (SOI) platform has known a significant development by exploiting the strong optical confinement, offered by this material platform, which is key for the miniaturization and realization of integrated optical devices (such as passive filters, splitters, junctions and multiplexers). However, the presence of strong nonlinear losses in the standard telecom band (around 1.55 µm) prevents some applications where a strong nonlinear optical response is needed and has motivated the research of more suitable material platforms. The primary goal of this thesis was the study of material alternatives to crystalline silicon (for instance hydrogenated amorphous silicon) with very low nonlinear losses and compatible with the CMOS process in order to realize integrated photonics devices based on nonlinear optical phenomena. Alternatively, the use of longer wavelengths (in the mid-IR) relaxes the constraints on the choice of the material platform, through taking advantage of lower nonlinear losses, for instance on the SiGe platform, which is also explored in this thesis. This work is organized as follows. In the first chapter we provide an overview of the nonlinear optical effects used to realize all optical signal processing functions, focusing on the key parameters that are essential (optical confinement and dispersion engineering) for integrated optical components, and presenting the main models used in this thesis. This chapter also includes a review of the main demonstrations reported on crystalline silicon, to give some benchmarks. Chapter 2 introduces the use of photonic crystals as integrated optical structures that can significantly enhance nonlinear optical phenomena. First we present photonic crystal cavities, with a demonstration of second and third harmonic generation that makes use of an original design. In the second part of the chapter, we describe the main features and challenges associated with photonic crystal waveguides in the slow light regime, which will be used later in chapter 4. In chapter 3, we report the experimental results related to the characterization of the optical nonlinear response of integrated waveguides made of two materials that are alternative to crystalline silicon : the hydrogenated amorphous silicon, probed in the near infrared, and the silicon germanium, probed in the mid-infrared. The model presented in chapter 1 is extensively used here for extracting the nonlinear parameters of these materials and it is also extended to account for higher order nonlinearities in the case of silicon germanium tested at longer wavelengths. This chapter also includes a comparison of the nonlinear properties of these two material platforms with respect to the standard SOI. In chapter 4, we combine the use of a material platform that is better suited than SOI for nonlinear applications with integrated photonics structures that are more advanced that those used in chapter 3. Here we describe the design of (slow) modes in photonic crystal waveguides made in hydrogenated amorphous silicon fully embedded in silica. [...]
Didier, Pierre. "Novel mid-infrared quantum cascade devices for applications in free-space optics, data security and microwave photonics". Electronic Thesis or Diss., Institut polytechnique de Paris, 2023. http://www.theses.fr/2023IPPAT029.
Pełny tekst źródłaThis doctoral thesis focuses on free-space optical (FSO) transmission in the mid-infrared region covering three main aspects: high-speed FSO transmission, private communication through chaotic synchronization, and integration of FSO-to-RF communication systems. In the field of high-speed FSO transmission, the research optimizes modulation schemes, equlaization for high speed data transmission in the mid-infrared spectrum. Cascade devices such as interband cascade lasers (ICLs) and quantum cascade lasers (QCLs) are utilized. Data rates of up to 14 Gbps are achieved using ICL and interband cascade interband photodetectors (ICIPs). QCLs and external modulators based on electrically modulated absorption are also implemented, achieving data rates up to 68 Gbps. These devices high modulated power, making them suitable for long-distance transmissions. The thesis also explores the application of chaos synchronization techniques for private communication over FSO links. Chaotic properties of light sources in the mid-infrared are leveraged, enabling the concealment of messages within chaotic signals. The complexity of the generated chaos allows for private transmission, with legitimate users achieving low error rates while non-legitimate users experience a higher error rate. Furthermore, the thesis investigates the integration of FSO and RF communication systems. The aim is to create a conversion between high-speed FSO links and RF links. Heterodyne beating techniques are utilized, combining quantum cascade lasers to generate beat signals. This approach enables the transmission of FSO signals over the Ka band through a QWIP detector. The research demonstrates the feasibility of FSO-to-RF integration, opening possibilities for combining the advantages of both communication systems. Overall, this thesis presents advancements in high-speed FSO transmission, secure communication using chaotic synchronization, and integration of FSO and RF systems. The research findings have implications for various fields, including telecommunications, satellite communication, and secure data transmission
Części książek na temat "Photonique dans le moyen infrarouge"
LONGUET, Claire, i Jean GUILMENT. "La spectroscopie proche infrarouge". W Spectroscopies vibrationnelles, 85–108. Editions des archives contemporaines, 2020. http://dx.doi.org/10.17184/eac.4198.
Pełny tekst źródłaStreszczenia konferencji na temat "Photonique dans le moyen infrarouge"
Magri, Julie, Ludovic Grossard, Laurent Delage i François Reynaud. "Projet ALOHA : Interféromètre fibré à conversion de fréquence dans le moyen et lointain infrarouge". W Les journées de l'interdisciplinarité 2022. Limoges: Université de Limoges, 2022. http://dx.doi.org/10.25965/lji.83.
Pełny tekst źródłaRaporty organizacyjne na temat "Photonique dans le moyen infrarouge"
Une introduction à l'analyse des sols par spectroscopie dans le visible et le proche infrarouge (vis-NIR) ainsi que dans le moyen infrarouge (MIR). FAO, luty 2024. http://dx.doi.org/10.4060/cb9005fr.
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