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Laboratory characterization of FIRSTv2 photonic chip for the study of substellar companions

Barjot, K. and Huby, E. and Vievard, S. and Cvetojevic, N. and Lacour, S. and Martin, G. and Deo, V. and Lapeyrere, V. and Rouan, D. and Guyon, O. and Lozi, J. and Jovanovic, N. and Cassagnettes, C. and Perrin, G. and Marchis, F. and Duchêne, G. and Kotani, T. (2020) Laboratory characterization of FIRSTv2 photonic chip for the study of substellar companions. In: Optical and Infrared Interferometry and Imaging VII. Proceedings of SPIE. No.11446. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 1144623. ISBN 9781510636798.

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FIRST (Fibered Imager foR a Single Telescope instrument) is a post-AO instrument that enables high contrast imaging and spectroscopy at spatial scales below the diffraction limit. FIRST achieves sensitivity and accuracy by a unique combination of sparse aperture masking, spatial filtering by single-mode fibers and cross-dispersion in the visible. The telescope pupil is divided into sub-pupils by an array of microlenses, coupling the light into single-mode fibers. The output of the fibers are rearranged in a non redundant configuration, allowing the measurement of the complex visibility for every baseline over the 600-900 nm spectral range. A first version of this instrument is currently integrated to the Subaru Extreme AO bench (SCExAO). This paper focuses on the on-going instrument upgrades and testings, which aim at increasing the instrument’s stability and sensitivity, thus improving the dynamic range. FIRSTv2’s interferometric scheme is based on a photonic chip beam combiner. We report on the laboratory characterization of two different types of 5-input beam combiner with enhanced throughput. The interferometric recombination of each pair of sub-pupils is encoded on a single output. Thus, to sample the fringes we implemented a temporal phase modulation by pistoning the segmented mirrors of a Micro-ElectroMechanical System (MEMS). By coupling high angular resolution and spectral resolution in the visible, FIRST offers unique capabilities in the context of the detection and spectral characterization of close companions, especially on 30m-class telescopes.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Huby, E.0000-0002-1342-2822
Vievard, S.0000-0003-4018-2569
Cvetojevic, N.0000-0002-7465-4176
Lacour, S.0000-0002-6948-0263
Guyon, O.0000-0002-1097-9908
Lozi, J.0000-0002-3047-1845
Jovanovic, N.0000-0001-5213-6207
Perrin, G.0000-0003-0680-0167
Marchis, F.0000-0001-7016-7277
Duchêne, G.0000-0002-5092-6464
Additional Information:© 2020 Society of Photo-Optical Instrumentation Engineers (SPIE).
Subject Keywords:Exoplanets, high contrast imaging, interferometry, pupil remapping, single-mode fiber filtering
Series Name:Proceedings of SPIE
Issue or Number:11446
Record Number:CaltechAUTHORS:20201222-152105725
Persistent URL:
Official Citation:K. Barjot, E. Huby, S. Vievard, N. Cvetojevic, S. Lacour, G. Martin, V. Deo, V. Lapeyrere, D. Rouan, O. Guyon, J. Lozi, N. Jovanovic, C. Cassagnettes, G. Perrin, F. Marchis, G. Duchêne, and T. Kotani "Laboratory characterization of FIRSTv2 photonic chip for the study of substellar companions", Proc. SPIE 11446, Optical and Infrared Interferometry and Imaging VII, 1144623 (13 December 2020);
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:107263
Deposited By: Tony Diaz
Deposited On:23 Dec 2020 00:46
Last Modified:16 Nov 2021 19:01

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