Dual-wavelength random-phase-shift interferometer for phasing large segmented primaries

Kjetil Dohlen; Frederique Decortiat; Francois Fresneau; Patrick Lanzoni

doi:10.1117/12.319302

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25 August 1998 Dual-wavelength random-phase-shift interferometer for phasing large segmented primaries

Kjetil Dohlen, Frederique Decortiat, Francois Fresneau, Patrick Lanzoni

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Proceedings Volume 3352, Advanced Technology Optical/IR Telescopes VI; (1998) https://doi.org/10.1117/12.319302
Event: Astronomical Telescopes and Instrumentation, 1998, Kona, HI, United States

Abstract

For active phasing of large segmented primary mirrors with thin, actively shaped controlled segments, we propose the use of a new, random phase-shift, dual wavelength, interferometric technique. We have considered a Michelson- type interferometer with diode lasers placed in the center of curvature of the primary, but another version employing a Mach-Zehnder interferometer with a pinhole in one arm placed in the telescope focal plane and using real or artificial star sources may also be considered. Results from a demonstration experiment are presented and discussed.

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Kjetil Dohlen, Frederique Decortiat, Francois Fresneau, and Patrick Lanzoni "Dual-wavelength random-phase-shift interferometer for phasing large segmented primaries", Proc. SPIE 3352, Advanced Technology Optical/IR Telescopes VI, (25 August 1998); https://doi.org/10.1117/12.319302

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