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

Authors
  • Chung, Cheng-Ying
  • Cho, Keng-Chi
  • Chang, Chih-Chiang
  • Lin, Cheng-Hsiang
  • Yen, Wei-Chung
  • Chen, Shean-Jen
Type
Published Article
Journal
Applied optics
Publication Date
May 20, 2006
Volume
45
Issue
15
Pages
3409–3414
Identifiers
PMID: 16708083
Source
Medline
License
Unknown

Abstract

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 0.02pi root mean square when the control loop is operated at a frequency of 30 Hz.

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