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Caractérisation de composants de filtrage modal pour l'observation d'exoplanète par interférométrie annulante.

Abstract : Nulling interferometry is considered for the study of exoplanets in the IR (6-20 um) and measuring their atmospheric emissions, reflecting a possible biological activity. To reach the interferometric contrast required to separate the planetary signal of the stellar signal, the wave fronts from the telescopes should overlap perfectly. The best solution consists of using a single mode waveguide collecting the planetary flux regardless of optical aberrations. My work was to characterize such integrated optics components. I have implemented for this study three methods: the monochromatic modal distinction by imaging, the measurement of the single-mode behavior spectral band by FTS and the measurement of the performance of filtering using interferometry. To carry out this work it was necessary to perform a system analysis of the entire optical bench, especially for the study by interferometry, in which the constraints on the vibration, the intensity balancing as well as the positioning of optical elements are very strong. The analyzed components were hollow metal waveguide (HMW) and dielectric silver halide material (SH). My work on the HMW closes their study started before my thesis. The three methods were used to characterize SH components (flat guides and optical fibers). The HMW are efficient modal filters but requires very rigorous manufacturing to limit the propagation losses. The fiber lengths of SH are longer (with lower losses per unit length), that can be reduced by the addition of absorbent layer on the cladding.
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https://tel.archives-ouvertes.fr/tel-00526348
Contributor : Romain Grille <>
Submitted on : Thursday, October 14, 2010 - 1:16:51 PM
Last modification on : Friday, November 6, 2020 - 4:09:13 AM
Long-term archiving on: : Friday, December 2, 2016 - 10:58:02 AM

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  • HAL Id : tel-00526348, version 1

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Citation

Grille Romain. Caractérisation de composants de filtrage modal pour l'observation d'exoplanète par interférométrie annulante.. Astrophysique [astro-ph]. Université Joseph-Fourier - Grenoble I, 2009. Français. ⟨tel-00526348⟩

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