Interféromètre à somme de fréquences dédié à l'imagerie haute résolution pour l'astronomie en bande L

Abstract : Stellar interferometers are high angular resolution devices, allowing for detailed research of the Universe. This thesis describes the in-lab implementation of a sum frequency generation interferometer dedicated to the infrared detection in the L band : ALOHA@3.39. In the aim of limiting thermal noise due to the room radiation, and benefit mature detectors and fibered components, this device includes a sum frequency generation non-linear process on each of its arms. Stellar radiations around 3.39 μm are transposed to around 810 nm thanks to PPLN cristals powered by a single pump signal at 1064 nm. The first part presents our global experimental context and theoretical elements about this thesis. The second part deals with the conception, the implementation and characterisation of the test bench ALOHA@3.39. The third part tables in-lab experimental results. Repeated measurements of the fringe contrast on high flux regime allow to calibrate the instrumental contrast of the set-up. First measurements on photon counting regime show we are currently able to detect interference fringes with high contrast with only 100 fW at the input of each arm. Finally, our research led us to realise interference fringes detection via the ALOHA@3.39 prototype, observing a thermal source, considered as a black body. This thesis concludes on an estimation of the limiting reachable magnitude, and on the future use of new PPLN technologies.
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Ludovic Szemendera. Interféromètre à somme de fréquences dédié à l'imagerie haute résolution pour l'astronomie en bande L. Optique / photonique. Université de Limoges, 2017. Français. ⟨NNT : 2017LIMO0020⟩. ⟨tel-01576695⟩

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