Physics – Optics
Scientific paper
Aug 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26as..145..305c&link_type=abstract
Astronomy and Astrophysics Supplement, v.145, p.305-310
Physics
Optics
12
Telescopes, Techniques: Interferometric, Adaptive Optics, Instrumentation: Large Telescopes, Optical Fibers: Single-Mode, Infrared: General
Scientific paper
The theory of starlight coupling into single-mode fibers is reviewed to show how i) the central obstruction in a telescope pupil deteriorates coupling efficiency much more than one would expect from the loss of collecting area, and ii) a single-mode fiber and a photometer can be used to monitor fast Strehl ratio fluctuations. This last point is illustrated with experimental data obtained at the 3.6 m La Silla telescope corrected with the ADONIS adaptive optics system. A 37x gain in coupling efficiency was demonstrated by turning on the adaptive optics system, but periodic fluctuations in the coupled signal revealed a vibration of the telescope tube that could not have been detected otherwise.
Coudé du Foresto Vincent
Faucherre Michel
Gitton Ph.
Hubin Norbert N.
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