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Proceedings Paper

Spatial filtering in AMBER
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Paper Abstract

Optical fibers are now often used in long baseline interferometry because they offer spatial filtering which leads to better accuracy in presence of atmospheric turbulence. Although this property is now well-known and spatial filtering used at various interferometers (IOTA, PTI, ...) and planned for upcoming facilities (VLTI/AMBER, Keck), the underlying physics of spatial filtering is far from being understood. For example up to now, nobody has been able to theoretically predict in which conditions the use of spatial filters improves the quality of the measures. In this paper, we study the propagation of the light through different spatial filters (pinhole, step index fibers) and given preliminary theoretical prediction for the domain of superiority of spatial filtering. We show that for typical observations in the near-infrared with large telescopes corrected by a 64-actuators adaptive optics system, the spatial filtering always provide a better signal-to-noise ratio than the direct coupling of the light.

Paper Details

Date Published: 5 July 2000
PDF: 9 pages
Proc. SPIE 4006, Interferometry in Optical Astronomy, (5 July 2000); doi: 10.1117/12.390198
Show Author Affiliations
Pierre Mege, Observatoire de Grenoble (France)
Fabien Malbet, Observatoire de Grenoble (France)
Alain Chelli, Observatoire de Grenoble (France)

Published in SPIE Proceedings Vol. 4006:
Interferometry in Optical Astronomy
Pierre J. Lena; Andreas Quirrenbach, Editor(s)

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