首页|Wave Front Correction and Measurement by Using a Liquid Crystal Spatial Light Modulator
Wave Front Correction and Measurement by Using a Liquid Crystal Spatial Light Modulator
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NETL
NSTL
Trans Tech Publications Ltd
To correct wave front distortion, a phased only Liquid Crystal Spatial Light Modulator (LCSLM) is used. LCSLM can modulate the phase of the incident beam by changing the electric field applied to the transparent electrodes of a liquid crystal cell. The voltage change causes the refractive index of the liquid crystal change, so a phase shift produces. The distortion of a wave front can be measured by using a wave front interferometer. Since each pixel of SLM may be addressed and controlled independently, so proper voltage is supplied to each pixel to compensate the phase corresponding to the distortion. Before wave front correction, the LCSLM is tested and corrected by employing a Twyman-Green interferometer, which shows the relationship between the applied voltage and the phase value of each pixel. Experiment result shows that after error compensation of LCSLM, the wave front distortion correction accuracy reaches 0.06 X.
wave front correctionliquid crystalspatial light modulator
Jian Zhang、Liying Wu、Limin Zou
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School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150080, China
NETL
NSTL
Trans Tech Publications Ltd
