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Applied Optics

Applied Optics


  • Vol. 44, Iss. 22 — Aug. 1, 2005
  • pp: 4733–4744

Analysis of stellar interferometers as wave-front sensors

François Hénault  »View Author Affiliations

Applied Optics, Vol. 44, Issue 22, pp. 4733-4744 (2005)

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The basic principle and theoretical relationships of an original method are presented that allow the wave-front errors of a ground or spaceborne telescope to be retrieved when its main pupil is combined with a second, decentered reference optical arm. The measurement accuracy of such a telescope-interferometer is then estimated by means of various numerical simulations, and good performance is demonstrated, except in limited areas near the telescope pupil/s rim. In particular, it permits direct phase evaluation (thus avoiding the use of first- or second-order derivatives), which will be of special interest for the cophasing of segmented mirrors in future giant-telescope projects. Finally, the useful practical domain of the method is defined, which seems to be better suited for periodic diagnostics of space- or ground-based telescopes or to real-time scientific observations in some specific cases (e.g., the central star in instruments that search for extrasolar planets).

© 2005 Optical Society of America

OCIS Codes
(010.7350) Atmospheric and oceanic optics : Wave-front sensing
(070.2580) Fourier optics and signal processing : Paraxial wave optics
(100.5070) Image processing : Phase retrieval
(110.5100) Imaging systems : Phased-array imaging systems
(110.6770) Imaging systems : Telescopes

François Hénault, "Analysis of stellar interferometers as wave-front sensors," Appl. Opt. 44, 4733-4744 (2005)

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