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Proceedings Paper

Dual-wavelength random-phase-shift interferometer for phasing large segmented primaries
Author(s): Kjetil Dohlen; Frederique Decortiat; Francois Fresneau; Patrick Lanzoni
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Paper 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.

Paper Details

Date Published: 25 August 1998
PDF: 9 pages
Proc. SPIE 3352, Advanced Technology Optical/IR Telescopes VI, (25 August 1998); doi: 10.1117/12.319302
Show Author Affiliations
Kjetil Dohlen, Observatoire de Marseille (France)
Frederique Decortiat, Ecole Superieure d'Optique (France)
Francois Fresneau, Observatoire de Marseille (France)
Patrick Lanzoni, Observatoire de Marseille (France)


Published in SPIE Proceedings Vol. 3352:
Advanced Technology Optical/IR Telescopes VI
Larry M. Stepp, Editor(s)

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