Low-light-level adaptive optics for a two-telescope interferometer scheme

Details Low-light-level adaptive optics for a two-telescope interferometer scheme Low-light-level adaptive optics for a two-telescope interferometer scheme

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993spie.2029..380t&link_type=abstract

Proc. SPIE Vol. 2029, p. 380-389, Digital Image Recovery and Synthesis II, Paul S. Idell; Ed.

Physics

Optics

Scientific paper

We study the use of a cross-correlation algorithm as a sub-aperture slope estimator in a low light-level adaptive optics scheme for a two-telescope interferometer. Using a computer simulation of a Hartmann-Shack wavefront sensor to compare the algorithm against a conventional intensity-centroid estimator, we find that the cross-correlation algorithm marginally reduces the mean-square slope-measurement error under shot-noise limited conditions and significantly reduces the error in the presence of additive noise. We compare the performance of the two estimators in a two-telescope interferometer scheme by introducing wavefront sensor noise with appropriate variance in a full adaptive optics simulation, calculating measures-of-merit appropriate to interferometric imaging such as fringe visibility and coherent energy.

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