Performances orientées système de détecteurs infrarouge à super-réseaux en cryostat opérationnel

Abstract : Many photodetector technologies coexist in the infrared domain (wavelength between 1µm and 50µm). Each of them comes with its assets and drawbacks (cost, performance, compactness, etc.). Some technologies are well established and available while others are still under development. The superlattice technology (SL) recently made its way into the market. It is based on the periodic stack of semiconductors (InAs/GaSb), giving a quantum detector capable of detecting wavelengths between 1 and 32µm typically. Like other quantum infrared detectors, superlattice photodetectors need to be cooled at cryogenic temperature to maximize their electro-optical performance.The objective of this thesis is to evaluate the potential of the SLSL in IDDCA using system-oriented figures of merit, which also take into account the packaging of the detector. The present work is focused on the Modulation Transfer Function, which describes the system resolution and the ratio Residual Fixed Pattern Noise over Temporal Noise (RPFN/TN), which evaluates the temporal stability of the image quality.This present work successfully confirmed two promises of the SL in midwave infrared : the excellent stability of the image quality and the low flickering pixel count. Besides, the experimental benches developped (MTF and temporal stability alike) can be adapted to perform similar measurements with other technologies.
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Jean Nghiem Xuan. Performances orientées système de détecteurs infrarouge à super-réseaux en cryostat opérationnel. Optique [physics.optics]. Université Paris-Saclay, 2018. Français. ⟨NNT : 2018SACLX113⟩. ⟨tel-02061931⟩

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