Translator Disclaimer
24 July 2014 The fiber coupler and beam stabilization system of the GRAVITY interferometer
Author Affiliations +
We present the installed and fully operational beam stabilization and fiber injection subsystem feeding the 2nd generation VLTI instrument GRAVITY. The interferometer GRAVITY requires an unprecedented stability of the VLTI optical train to achieve micro-arcsecond astrometry. For this purpose, GRAVITY contains four fiber coupler units, one per telescope. Each unit is equipped with actuators to stabilize the telescope beam in terms of tilt and lateral pupil displacement, to rotate the field, to adjust the polarization and to compensate atmospheric piston. A special roof-prism offers the possibility of on-axis as well as off-axis fringe tracking without changing the optical train. We describe the assembly, integration and alignment and the resulting optical quality and performance of the individual units. Finally, we present the closed-loop performance of the tip-tilt and pupil tracking achieved with the final systems in the lab.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
O. Pfuhl, M. Haug, F. Eisenhauer, S. Kellner, F. Haussmann, G. Perrin, S. Gillessen, C. Straubmeier, T. Ott, K. Rousselet-Perraut, A. Amorim, Magdalena Lippa, A. Janssen, W. Brandner, Yitping Kok, N. Blind, L. Burtscher, E. Sturm, E. Wieprecht, M. Schoeller, J. Weber, O. Hans, and S. Huber "The fiber coupler and beam stabilization system of the GRAVITY interferometer", Proc. SPIE 9146, Optical and Infrared Interferometry IV, 914623 (24 July 2014);


Final two-stage MOAO on-sky demonstration with CANARY
Proceedings of SPIE (July 26 2016)
The Starfire Optical Range 3.5-m adaptive optical telescope
Proceedings of SPIE (February 04 2003)
GRAVITY: beam stabilization and light injection subsystems
Proceedings of SPIE (September 12 2012)
Characterization of adaptive optics at Keck Observatory
Proceedings of SPIE (December 24 2003)
Design of the 6.5 m MMT Adaptive Optics System and...
Proceedings of SPIE (March 21 1997)

Back to Top