Universität zu Köln

Nayak, Abani Shankar, Poletti, Thomas, Sharma, Tarun Kumar, Madhav, Kalaga ORCID: 0000-0002-6711-7137, Pedretti, Ettore, Labadie, Lucas ORCID: 0000-0001-5342-5713 and Roth, Martin M. (2020). Chromatic response of a four-telescope integrated-optics discrete beam combiner at the astronomical L band. Opt. Express, 28 (23). S. 34346 - 34362. WASHINGTON: OPTICAL SOC AMER. ISSN 1094-4087

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Abstract

We show the results of simulation and experimental study of a 4-telescope zig-zag discrete beam combiner (DBC) for long-baseline stellar interferometry working at the astronomical L band (3 - 4 mu m) under the influence of a narrow bandwidth light source. Following Saviauk et al. (2013), we used a quasi-monochromatic visibility-to-pixel matrix (V2PM) for retrieving the complex coherence functions from simulated and experimentally measured power at the output of the device. Simulation and coefficient of determination (R-2) measurements show that we are able to retrieve the visibility amplitudes with >95 % accuracy of our chromatic model source up to a bandwidth of 100 nm centred at 3.5 mu m. We characterized a DBC manufactured by 3D ultra-fast laser inscription (ULI) written on gallium lanthanum sulphate (GLS). Experimental results showed retrieval of visibility amplitude with an accuracy of 80-90 % at 69 nm bandwidth, validating our simulation. The standard deviation of experimental phase residuals are between 0.1-0.4 rad, which shows that the retrieval procedure is sufficient to get good quality images, where phase perturbations of less than 1 rad are expected under good seeing conditions for astronomical applications. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Nayak, Abani Shankar UNSPECIFIED UNSPECIFIED UNSPECIFIED Poletti, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Sharma, Tarun Kumar UNSPECIFIED UNSPECIFIED UNSPECIFIED Madhav, Kalaga UNSPECIFIED orcid.org/0000-0002-6711-7137 UNSPECIFIED Pedretti, Ettore UNSPECIFIED UNSPECIFIED UNSPECIFIED Labadie, Lucas UNSPECIFIED orcid.org/0000-0001-5342-5713 UNSPECIFIED Roth, Martin M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-311806
DOI:	10.1364/OE.405896
Journal or Publication Title:	Opt. Express
Volume:	28
Number:	23
Page Range:	S. 34346 - 34362
Date:	2020
Publisher:	OPTICAL SOC AMER
Place of Publication:	WASHINGTON
ISSN:	1094-4087
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics I
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language Optics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/31180