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The beam combiners of GRAVITY VLTI instrument: concept, development, and performance in laboratory

The beam combiners of GRAVITY VLTI instrument: concept, development, and performance in laboratory
The beam combiners of GRAVITY VLTI instrument: concept, development, and performance in laboratory
Gravity is one of the second-generation instruments of the Very Large Telescope Interferometer that operates in the near infrared range and that is designed for precision narrow-angle astrometry and interferometric imaging. With its infrared wavefront sensors, pupil stabilization, fringe tracker, and metrology, the instrument is tailored to provide a high sensitivity, imaging with 4-millisecond resolution, and astrometry with a 10µarcsec precision. It will probe physics close to the event horizon of the Galactic Centre black hole, and allow to study mass accretion and jets in young stellar objects and active galactic nuclei, planet formation in circumstellar discs, or detect and measure the masses of black holes in massive star clusters throughout the Milky Way. As the instrument required an outstanding level of precision and stability, integrated optics has been chosen to collect and combine the four VLTI beams in the K band. A dedicated integrated optics chip glued to a fiber array has been developed. Technology breakthroughs have been mandatory to fulfill all the specifications. This paper is focused on the interferometric beam combination system of Gravity. Once the combiner concept described, the paper details the developments that have been led, the integration and the performance of the assemblies.
1-12
SPIE
Jocou, L.
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Rousselet-Perraut, K.
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Moulin, T.
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Magnard, Y.
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Labeye, P.R.
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Lapras, V.
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Perrin, G.S.
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Eisenhauer, F.
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Holmes, C.
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Amorim, A.
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Brandner, W.
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Straubmeier, C.
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Jocou, L.
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Rousselet-Perraut, K.
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Moulin, T.
e1c85c64-7d91-430b-8af9-87d6f2d005ae
Magnard, Y.
53887a3a-6e9e-416a-b044-5cec864518de
Labeye, P.R.
6162bc3c-a2fb-48ef-b623-f72ab053e5be
Lapras, V.
f39ac4a5-0fc8-4476-94c5-fea824c31707
Perrin, G.S.
2db58a96-6d7b-41b7-8279-17fab60ae346
Eisenhauer, F.
aeed4378-2137-4e02-8715-fc9c289a92cd
Holmes, C.
16306bb8-8a46-4fd7-bb19-a146758e5263
Amorim, A.
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Brandner, W.
38656bb2-d937-4a9e-98a8-d205ded7f371
Straubmeier, C.
5589f023-0317-4e8e-8652-9cfac5cd61ed

Jocou, L., Rousselet-Perraut, K., Moulin, T., Magnard, Y., Labeye, P.R., Lapras, V., Perrin, G.S., Eisenhauer, F., Holmes, C., Amorim, A., Brandner, W. and Straubmeier, C. (2014) The beam combiners of GRAVITY VLTI instrument: concept, development, and performance in laboratory. In Optical and Infrared Interferometry IV. vol. 9146, SPIE. pp. 1-12 . (doi:10.1117/12.2054159).

Record type: Conference or Workshop Item (Paper)

Abstract

Gravity is one of the second-generation instruments of the Very Large Telescope Interferometer that operates in the near infrared range and that is designed for precision narrow-angle astrometry and interferometric imaging. With its infrared wavefront sensors, pupil stabilization, fringe tracker, and metrology, the instrument is tailored to provide a high sensitivity, imaging with 4-millisecond resolution, and astrometry with a 10µarcsec precision. It will probe physics close to the event horizon of the Galactic Centre black hole, and allow to study mass accretion and jets in young stellar objects and active galactic nuclei, planet formation in circumstellar discs, or detect and measure the masses of black holes in massive star clusters throughout the Milky Way. As the instrument required an outstanding level of precision and stability, integrated optics has been chosen to collect and combine the four VLTI beams in the K band. A dedicated integrated optics chip glued to a fiber array has been developed. Technology breakthroughs have been mandatory to fulfill all the specifications. This paper is focused on the interferometric beam combination system of Gravity. Once the combiner concept described, the paper details the developments that have been led, the integration and the performance of the assemblies.

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More information

e-pub ahead of print date: 24 July 2014
Venue - Dates: SPIE Astronomical Telescopes and Instrumentation, Montréal, Canada, 2014-06-22 - 2014-06-27
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 368536
URI: https://eprints.soton.ac.uk/id/eprint/368536
PURE UUID: 03958caa-2419-4b1f-b524-4cb415f1f2cf
ORCID for C. Holmes: ORCID iD orcid.org/0000-0001-9021-3760

Catalogue record

Date deposited: 18 Sep 2014 12:50
Last modified: 08 Oct 2019 00:44

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Contributors

Author: L. Jocou
Author: K. Rousselet-Perraut
Author: T. Moulin
Author: Y. Magnard
Author: P.R. Labeye
Author: V. Lapras
Author: G.S. Perrin
Author: F. Eisenhauer
Author: C. Holmes ORCID iD
Author: A. Amorim
Author: W. Brandner
Author: C. Straubmeier

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