Perraut, K., Jocou, L., Berger, J. P., Chabli, A., Cardin, V., Chamiot-Maitral, G., Delboulbe, A., Eisenhauer, F., Gamberini, Y., Gillessen, S., Guieu, S., Guerrero, J., Haug, M., Hausmann, F., Joulain, F., Kervella, P., Labeye, P., Lacour, S., Lanthermann, C., Lapras, V., Le Bouquin, J. B., Lippa, M., Magnard, Y., Moulin, T., Noel, P., Nolot, A., Patru, F., Perrin, G., Pfuhl, O., Pocas, S., Poulain, S., Scibetta, C., Stadler, E., Templier, R., Ventura, N., Vizioz, C., Amorim, A., Brandner, W. and Straubmeier, C. (2018). Single-mode waveguides for GRAVITY I. The cryogenic 4-telescope integrated optics beam combiner. Astron. Astrophys., 614. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

Context. Within the framework of the second-generation instrumentation of the Very Large Telescope Interferometer of the European Southern Observatory we have developed the four-telescope beam combiner in integrated optics. Aims. We optimized the performance of such beam combiners, for the first time in the near-infrared K band, for the GRAVITY instrument dedicated to the study of the close environment of the galactic centre black hole by precision narrow-angle astrometry and interferometric imaging. Methods. We optimized the design of the integrated optics chip and the manufacturing technology as well, to fulfil the very demanding throughput specification. We also designed an integrated optics assembly able to operate at 200 K in the GRAVITY cryostat to reduce thermal emission. Results. We manufactured about 50 beam combiners by silica-on-silicon etching technology. We glued the best combiners to single mode fluoride fibre arrays that inject the VLTI light into the integrated optics beam combiners. The final integrated optics assemblies have been fully characterized in the laboratory and through on-site calibrations: their global throughput over the K band is higher than 55% and the instrumental contrast reaches more than 95% in polarized light, which is well within the GRAVITY specifications. Conclusions. While integrated optics technology is known to be mature enough to provide efficient and reliable beam combiners for astronomical interferometry in the H band, we managed to successfully extend it to the longest wavelengths of the K band and to manufacture the most complex integrated optics beam combiner in this specific spectral band.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Perraut, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jocou, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Berger, J. P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Chabli, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cardin, V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Chamiot-Maitral, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Delboulbe, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Eisenhauer, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gamberini, Y.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gillessen, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Guieu, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Guerrero, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Haug, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hausmann, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Joulain, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kervella, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Labeye, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lacour, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lanthermann, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lapras, V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Le Bouquin, J. B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lippa, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Magnard, Y.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Moulin, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Noel, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nolot, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Patru, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Perrin, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pfuhl, O.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pocas, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Poulain, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Scibetta, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Stadler, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Templier, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ventura, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Vizioz, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Amorim, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Brandner, W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Straubmeier, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-182864
DOI: 10.1051/0004-6361/201732544
Journal or Publication Title: Astron. Astrophys.
Volume: 614
Date: 2018
Publisher: EDP SCIENCES S A
Place of Publication: LES ULIS CEDEX A
ISSN: 1432-0746
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
ASTRONOMICAL INTERFEROMETRY; FRONT SENSORS; K-BAND; VLTI; CIAOMultiple languages
Astronomy & AstrophysicsMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/18286

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