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Proceedings Paper

Lithium Niobate active beam combiners: results of on-chip fringe locking, fringe scanning and high contrast integrated optics interferometry and spectrometry
Author(s): Guillermo Martin; Samuel Heidmann; Fabrice Thomas; Mikhael de Mengin; Laurent Jocou; Gwenn Ulliac; Nadège Courjal; Alain Morand; Pierre Benech; Etienne P. le Coarer
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Paper Abstract

The context of this work is the development of integrated optic beam combiners devoted to high contrast interferometry, in particular for exoplanet spectral characterization and future spatial missions, where the use of compact and light optical beam combiners ensures robustness and stability of the interferometric signal. Thus, the development of materials allowing light confinement in both polarizations, together with a good transparency from the visible to the mid-IR and able to achieve electro-optic modulation, in order to finely tune the relative phase of the interacting fields, is knowing a rapid development. Lithium Niobate is an electro-optical material allowing index, and thus optical phase modification, by application of an external electric field. It is also well known for waveguide realization in the visible, near and midinfrared. Here we present results on near and mid-infrared beam combiners achieving different optical functions: a) three telescope AC beam combiner, devoted to phase closure studies; b) Phase locking and fringe scanning using double Mach-Zehnder concept. Optimization of the fringe contrast by real time on-chip phase and photometry balance and c) High Resolution Spectrometers in channel waveguides.

Paper Details

Date Published: 24 July 2014
PDF: 10 pages
Proc. SPIE 9146, Optical and Infrared Interferometry IV, 91462I (24 July 2014); doi: 10.1117/12.2055516
Show Author Affiliations
Guillermo Martin, Institut de Planétologie et d’Astrophysique de Grenoble, CNRS, Univ. Grenoble Alpes (France)
Samuel Heidmann, Institut de Planétologie et d’Astrophysique de Grenoble, CNRS, Univ. Grenoble Alpes (France)
Fabrice Thomas, Institut de Planétologie et d’Astrophysique de Grenoble, CNRS, Univ. Grenoble Alpes (France)
Mikhael de Mengin, Institut de Planétologie et d’Astrophysique de Grenoble, CNRS, Univ. Grenoble Alpes (France)
Laurent Jocou, Institut de Planétologie et d’Astrophysique de Grenoble, CNRS, Univ. Grenoble Alpes (France)
Gwenn Ulliac, FEMTO-ST, CNRS, Univ. de Franche-Comté (France)
Nadège Courjal, FEMTO-ST, CNRS, Univ. de Franche-Comté (France)
Alain Morand, IMEP-LAHC, CNRS, Univ. Grenoble Alpes (France)
Pierre Benech, IMEP-LAHC, CNRS, Univ. Grenoble Alpes (France)
Etienne P. le Coarer, Institut de Planétologie et d’Astrophysique de Grenoble, CNRS, Univ. Grenoble Alpes (France)


Published in SPIE Proceedings Vol. 9146:
Optical and Infrared Interferometry IV
Jayadev K. Rajagopal; Michelle J. Creech-Eakman; Fabien Malbet, Editor(s)

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