Fringe visibility performance evaluation for long baseline stellar interferometers with adaptive optics

Details Fringe visibility performance evaluation for long baseline stellar interferometers with adaptive optics Fringe visibility performance evaluation for long baseline stellar interferometers with adaptive optics

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004spie.5491.1147t&link_type=abstract

New Frontiers in Stellar Interferometry, Proceedings of SPIE Volume 5491. Edited by Wesley A. Traub. Bellingham, WA: The Intern

Physics

Optics

Scientific paper

Long baseline stellar interferometers have been considered an essential tool in studying astrophysics; however, fringe visibilities for stellar interferometers with large apertures are often corrupted by atmospheric turbulence. To reduce the atmospheric turbulence effect, adaptive optics may be used to enhance fringe visibility for stellar interferometers with aperture sizes larger than the atmospheric coherence length. Fringe visibility performance evaluation for long baseline stellar interferometers with and without adaptive optics is presented in this paper. The methodologies used in this paper are described as follows: the optical transfer function for stellar interferometers with large apertures is derived first; then, performance metrics, coherence loss factor and Strehl ratio, are defined. Finally, fringe visibility performance with and without adaptive optics for different turbulent strengths is evaluated using computer simulation results. We show that Noll's mean square residual phase error can be used to compare the coherence loss factor of an interferometer with the Strehl ratio of a single telescope.

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