Dissertation/ Thesis
Supercontinuum laser sources for broadband CARS microspectroscopy ; Sources de supercontinuum pour la microspectroscopie Raman cohérente large-bande
| العنوان: | Supercontinuum laser sources for broadband CARS microspectroscopy ; Sources de supercontinuum pour la microspectroscopie Raman cohérente large-bande |
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| المؤلفون: | Louot, Christophe |
| المساهمون: | Photonique Fibre et Sources Cohérentes (XLIM-PHOT), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Université de Limoges, Vincent Couderc, Dominique Pagnoux |
| المصدر: | https://theses.hal.science/tel-01788776 ; Optique / photonique. Université de Limoges, 2018. Français. ⟨NNT : 2018LIMO0015⟩. |
| بيانات النشر: | CCSD |
| سنة النشر: | 2018 |
| المجموعة: | Université de Limoges: HAL |
| مصطلحات موضوعية: | Supercontinuum generation, CARS spectroscopy, Optical instrumentation, Nonlinear optics, Optical fiber, Fiber amplifiers, Raman cascading, Génération de supercontinuum, Spectroscopie Raman cohérente, Instrumentation optique, Optique non-linéaire, Fibre optique, Fibre amplificatrice, Cascade Raman, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic |
| الوصف: | Coherent Raman microspectroscopy (CARS) is an optical method used to identify molecular bonds in a sample in order to analyze and determine its complete composition. It requires the simultaneous excitation of the sample by two waves (the pump wave and the Stokes wave) in order to induce resonant vibration of the bond to be detected. For multiple bonds analysis (broadband coherent Raman microspectroscopy our Multiplex-CARS), the monochromatic Stokes wave must be replaced by a broadband beam (supercontinuum). The aim of this thesis was to design supercontinuum sources optimized for Multiplex-CARS application, in particular in terms of spectral bandwidth and spectral power density. Supercontinuum generation was investigated in three different optical fibers: (i) a microstructured single mode fiber with a large Yb doped core in which the input beam was re-amplified all along its propagation; (ii) a conventional singlemode fiber pumped in the normal dispersion regime in which spectral broadening was achieved by means of Raman gain saturation; (iii) a conventional graded-index multimode fiber in which the beam spectrally broadened by Raman gain saturation at very high power also experienced spatial self-cleaning by Kerr effect, resulting in a high brillance output beam with an,intensity profile close to that of the fundamental mode. A complete spectrotemporal study is achieved for each of these three sources. ; La microspectroscopie Raman cohérente (CARS) est une méthode d'analyse optique sans marqueur qui permet d'identifier des liaisons moléculaires dans un milieu d'intérêt (échantillon) pour permettre de déterminer la composition chimique de ce milieu. Elle nécessite l'excitation concomitante de l'échantillon par deux ondes spectralement décalées (onde pompe et onde Stokes) afin de faire entrer en résonance les liaisons à détecter. Pour la détection de plusieurs liaisons simultanément (microspectroscopie Raman cohérente large-bande ou Multiplex-CARS), la source Stokes monochromatique est remplacée par une source ... |
| نوع الوثيقة: | doctoral or postdoctoral thesis |
| اللغة: | French |
| Relation: | NNT: 2018LIMO0015 |
| الاتاحة: | https://theses.hal.science/tel-01788776 https://theses.hal.science/tel-01788776v1/document https://theses.hal.science/tel-01788776v1/file/2018LIMO0015.pdf |
| Rights: | info:eu-repo/semantics/OpenAccess |
| رقم الانضمام: | edsbas.A30F293D |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |