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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 45, Iss. 15 — May. 20, 2006
  • pp: 3409–3414

Adaptive-optics system with liquid-crystal phase-shift interferometer

Cheng-Ying Chung, Keng-Chi Cho, Chih-Chiang Chang, Cheng-Hsiang Lin, Wei-Chung Yen, and Shean-Jen Chen  »View Author Affiliations

Applied Optics, Vol. 45, Issue 15, pp. 3409-3414 (2006)

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We develop an adaptive-optics system based on a Mach–Zehnder radial shearing interferometer with liquid-crystal-device (LCD) phase-shift interferometry (PSI). Using accurate phase calibration and transient nematic driving of the LCD, the developed three-step PSI procedure can be achieved in a time of 5   ms . The proposed Mach–Zehnder radial shearing PSI method reconstructs the phase information using a digital signal processor (DSP). The DSP then computes appropriate control signals to drive a deformable mirror in such a way as to eliminate the wavefront distortion. The current adaptive-optics system is capable of suppressing low-frequency thermal disturbances with a signal-to-noise ratio improvement of more than 20   dB and a steady-state phase error of less than 0.02 π root mean square when the control loop is operated at a frequency of 30   Hz .

© 2006 Optical Society of America

OCIS Codes
(010.1080) Atmospheric and oceanic optics : Active or adaptive optics
(100.5070) Image processing : Phase retrieval

ToC Category:
Adaptive Optics

Original Manuscript: October 24, 2005
Revised Manuscript: January 11, 2006
Manuscript Accepted: January 19, 2006

Cheng-Ying Chung, Keng-Chi Cho, Chih-Chiang Chang, Cheng-Hsiang Lin, Wei-Chung Yen, and Shean-Jen Chen, "Adaptive-optics system with liquid-crystal phase-shift interferometer," Appl. Opt. 45, 3409-3414 (2006)

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