Analyse du bruit lors de la génération de somme de fréquences dans les cristaux de niobate de lithium périodiquement polarisés (PPLN) et applications en régime de comptage de photons

Abstract : The sum frequency generation process is used in differents applications to convert signals from infrared wavelengths to the field of visible wavelength. This allows to benefit of more efficient technologies in terms of detection and propagation. This thesis describes the study of noise phenomena generated by this process in crystals of periodically poled lithium niobate (PPLN) for frequency up-conversion applications in photon counting regime. The first part of the manuscript shows the advantage of sum frequency generation process in the technological environment of the infrared detection on single photon counting regime, using the concept of hybrid detection. The theoretical elements and the state of the art associated with hybrid detection will also be presented in this first part. The second part deals with a comparative study between different PPLN for hybrid detection at 1550 nm. A detailed experimental analysis of the noise process is performed. The results of this study are used for applications in astronomy and microscopy. The third part deals with an application of the sum frequency in stellar interferometry. The results of PPLN’s characterization are involved in optimizing an instrument for astronomy called sum frequency interferometer. The results of observation on the astronomical site of Mount Wilson and the prospects of this instrument are presented.
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Romain Baudoin. Analyse du bruit lors de la génération de somme de fréquences dans les cristaux de niobate de lithium périodiquement polarisés (PPLN) et applications en régime de comptage de photons. Optique / photonique. Université de Limoges, 2014. Français. ⟨NNT : 2014LIMO0068⟩. ⟨tel-01161789⟩

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