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Proceedings Paper

Integrated discrete beam combiner with a pupil remapper for stellar interferometry (Conference Presentation)

Paper Abstract

Stellar interferometry performed in integrated photonic devices allows to increase the angular resolution of a ground-based telescope. Here we present the fabrication and characterization of a low-loss polarization insensitive photonic circuit for astrophotonics, whose geometry was engineered to combine interferometrically up to eight input beams. The employed fabrication technique consisted in the femtosecond laser micromachining followed by a thermal annealing to reduce the birefringence of the waveguides. The fabricated device was characterized to validate its functioning in terms of polarization insensitivity, good transmission and proper beam combination, thus benchmarking its suitability with real on-sky observations.

Paper Details

Date Published: 9 March 2020
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Proc. SPIE 11287, Photonic Instrumentation Engineering VII, 112870B (9 March 2020); doi: 10.1117/12.2545027
Show Author Affiliations
Simone Piacentini, Politecnico di Milano (Italy)
CNR-Istituto di Fotonica e Nanotecnologie (Italy)
Giacomo Corrielli, CNR-Istituto di Fotonica e Nanotecnologie (Italy)
Abani Shankar Nayak, Leibniz-Institut für Astrophysik Potsdam (Germany)
Tarun Kumar Sharma, Univ. zu Köln (Germany)
Kalaga V. Madhav, Leibniz-Institut für Astrophysik Potsdam (Germany)
Ettore Pedretti, STFC Rutherford Appleton Lab. (United Kingdom)
Stefano Minardi, Leibniz-Institut für Astrophysik Potsdam (Germany)
Lucas Labadie, Univ. zu Köln (Germany)
Roberto Osellame, CNR-Istituto di Fotonica e Nanotecnologie (Italy)


Published in SPIE Proceedings Vol. 11287:
Photonic Instrumentation Engineering VII
Yakov Soskind; Lynda E. Busse, Editor(s)

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