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TitleFeedback interferometry with membrane mirror for adaptive optics
Publication TypeJournal Article
Year of Publication2003
AuthorsCheung, D.C.L., Barnes T.H., and Haskell T.G.
JournalOptics Communications
Pagination33 - 41
Date Published2003
ISSN00304018 (ISSN)
KeywordsAberrations, Actuators, Adaptive optics, Differential equations, Feedback, Interferometry, Membrane mirrors, Mirrors, Optical sensors, Phase modulation
AbstractFeedback interferometers can be used for many optical measurements as well as aberration correction. The choice of the phase modulator in the interferometer has major influence on the operation of the feedback system. Conventional wisdom is that independent actuator movement is a basic requirement for the modulator in order to allow the feedback system to operate in stable fashion and that membrane mirrors are not suitable. We demonstrate the operation of a feedback interferometer which uses a membrane mirror as the phase modulator. We show that even with the strong coupling introduced by the influence function of the membrane mirror, the feedback system can still operate normally. Our interferometer is based on a radial shearing polarizing Sagnac interferometer. The current system is able to correct static aberration with significant improvement on Strehl ratio. © 2003 Elsevier Science B.V. All rights reserved.

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