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

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

© 2006 Optical Society of America

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