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First stellar photons for an integrated optics discrete beam combiner at the William Herschel Telescope
Authors
Lisa F. Bardou
Nazim A. Bharmal
+17 more
Jean-Tristan M. Buey
Fanny Chemla
Mathieu Cohen
Giacomo Corrielli
Aline N. Dinkelaker
Éric Gendron
Lucas Labadie
Kalaga V. Madhav
Timothy J. Morris
Abani Shankar Nayak
James Osborn
Roberto Osellame
Ettore Pedretti
Simone Piacentini
Martin M. Roth
Tarun Kumar Sharma
Lazar Staykov
Publication date
1 January 2021
Publisher
Washington, DC : The Optical Society
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Cite
Abstract
We present the first on-sky results of a four-telescope integrated optics discrete beam combiner (DBC) tested at the 4.2mWilliamHerschel Telescope. The device consists of a four-input pupil remapper followed by a DBC and a 23-output reformatter. The whole device was written monolithically in a single alumino-borosilicate substrate using ultrafast laser inscription. The device was operated at astronomical H-band (1.6 μm), and a deformable mirror along with a microlens array was used to inject stellar photons into the device. We report the measured visibility amplitudes and closure phases obtained on Vega and Altair that are retrieved using the calibrated transfer matrix of the device. While the coherence function can be reconstructed, the on-sky results show significant dispersion from the expected values. Based on the analysis of comparable simulations, we find that such dispersion is largely caused by the limited signal-to-noise ratio of our observations. This constitutes a first step toward an improved validation of theDBCas a possible beam combination scheme for long-baseline interferometry. © 2021 Optical Society of America
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Last time updated on 23/07/2022