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Étude et développement d'un oscillateur paramétrique optique picoseconde rapidement accordable utilisant des cristaux à quasi-accord de phase apériodique : application à la détection de gaz par imagerie active

Abstract : Spectroscopy applications related to greenhouse gases or other gaseous pollutants involve the development of optical sources emitting in the mid-infrared region. A picosecond optical parametric oscillator (OPO) is one of these few sources. The specificity of the picosecond OPO reported in this thesis is its wide gain bandwidth obtained through the use of aperiodically poled nonlinear crystals. The first study aims to characterize and develop the specificity of broadband picosecond OPO, with an emphasis on the origin of the spectral modulation observed from the threshold: the signal spectrum consist of a main peak and a succession of lateral secondary peaks. This OPO is then associated with a chirped volume Bragg grating (CVBG) whose displacement, around the position which respects the synchronous pumping condition, changes the oscillating wavelength. The ability of this highly tunable OPO is finally tested to detect N₂O gas emissions with a backscattering gas imaging technique.
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Guillaume Walter. Étude et développement d'un oscillateur paramétrique optique picoseconde rapidement accordable utilisant des cristaux à quasi-accord de phase apériodique : application à la détection de gaz par imagerie active. Optique [physics.optics]. Université Paris-Saclay, 2020. Français. ⟨NNT : 2020UPASS046⟩. ⟨tel-02886152⟩

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