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Proceedings Paper

First results on an electro-optic visible multi-telescope beam combiner for next generation FIRST/SUBARU instruments
Author(s): G. Martin; F. Gardillou; C. Cassagnettes; D. Barbier; C. Guyot; J. Hauden; G. Ulliac; N. Courjal; N. Cvetojevic; E. Huby; S. Lacour
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Paper Abstract

Integrated optic devices are nowadays achieving extremely high performances in the field of astronomical interferometry, as shown by the PIONIER and GRAVITY instruments. Progress remains to be made in order to increase the number of apertures/beams/channels to be combined (up to 9) and eventually ensure on-chip phase modulation (for fringe temporal scanning). We present a novel generation of beam combiners, based on the hybridization of two integrated optic devices: (i) one producing glass waveguides, that can ensure very sharp bend radius, high confinement and low propagation losses, with (ii) a lithium niobate device providing phase modulators and channel waveguides that can achieve on-chip, fast (<100kHz) phase modulation. The aim of this work is to compare three different concepts for the new generation FIRST/SUBARU 9T instrument, in terms of transmission, birefringence, half-wave voltage modulation and spectral range.

Paper Details

Date Published: 9 July 2018
PDF: 8 pages
Proc. SPIE 10701, Optical and Infrared Interferometry and Imaging VI, 107012V (9 July 2018); doi: 10.1117/12.2312841
Show Author Affiliations
G. Martin, Univ. Grenoble Alpes, CNRS, Institut de Planétologie et d’Astrophysique de Grenoble (France)
F. Gardillou, Teem Photonics (France)
C. Cassagnettes, Teem Photonics (France)
D. Barbier, Teem Photonics (France)
C. Guyot, iXBlue PSD (France)
J. Hauden, iXBlue PSD (France)
G. Ulliac, FEMTO-ST, Univ. Franche-Comté (France)
N. Courjal, FEMTO-ST, Univ. Franche-Comté (France)
N. Cvetojevic, LESIA, CNRS (France)
E. Huby, LESIA, CNRS (France)
S. Lacour, LESIA, CNRS (France)

Published in SPIE Proceedings Vol. 10701:
Optical and Infrared Interferometry and Imaging VI
Michelle J. Creech-Eakman; Peter G. Tuthill; Antoine Mérand, Editor(s)

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