First results from a laboratory hypertelescope with single-mode fibers

Details First results from a laboratory hypertelescope with single-mode fibers First results from a laboratory hypertelescope with single-mode fibers

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sf2a.conf...61p&link_type=abstract

SF2A-2007: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics held in Grenoble, France, July

Astronomy and Astrophysics

Astrophysics

Scientific paper

In the future, giant optical interferometric arrays will be developed with kilometric baselines and a large number of telescopes. Such arrays could have direct imaging capabilities if optimized beam combiners are used. This paper aims at studying the performances of an interferometric beam combiner using single mode fibers and the hypertelescope principle. A laboratory testbed called SIRIUS has been developed. We present here the results obtained and analyzed with the help of a numerical simulator. Direct images have been obtained at the densified focus of SIRIUS. It is shown that the fibers improve the quality and the stability of the direct image. The computed images allow to reproduce the effects of differential photometry and the influence of optical path difference (OPD) variations. OPD's errors less than λ/10 and differential photometries less than 60% are required to keep the quality of the direct image. The excellent comparison between experience and simulation clearly shows the simplicity of the fibered pupil densifier. It also gives us a great confidence in the extrapolation of these results and specifications for future arrays with a very large number of apertures.

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