SNR on visibilities for fibered interferometers

Details SNR on visibilities for fibered interferometers SNR on visibilities for fibered interferometers

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002sf2a.conf..233t&link_type=abstract

SF2A-2002: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 24-29, 2002, Eds.: F. Combes and D. Barret,

Physics

Optics

Scientific paper

Spatial filtering properties of optical waveguides (monomode fibers, integrated optics) are more and more used in ground-based interferometry for we know it provides highly accurate visibilities measurements. We compute the theoretical SNR on the modal visibility with partial adaptative corrections, taking into account photon noise,additive noise and the coupling variations at the wavefront/fiber interface. We show that, except for point sources, atmospheric fluctuations add a pure turbulent term in the visibility error. This turbulent term is independent on the source brightness and is all the higher than the source is extended. We conclude that i) for strong fluxes, the SNR per interferogram saturates to a constant value and, ii) large Strehl fluctuations will significantly decrease the limiting magnitude. This pleads in favor of high-order adaptive optics combined with the waveguide.

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