Paper Title:
Wave Front Correction and Measurement by Using a Liquid Crystal Spatial Light Modulator
  Abstract

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 λ.

  Info
Periodical
Edited by
Yuri Chugui, Yongsheng Gao, Kuang-Chao Fan, Roald Taymanov and Ksenia Sapozhnikova
Pages
319-323
DOI
10.4028/www.scientific.net/KEM.437.319
Citation
J. Zhang, L. Y. Wu, L. M. Zou, "Wave Front Correction and Measurement by Using a Liquid Crystal Spatial Light Modulator", Key Engineering Materials, Vol. 437, pp. 319-323, 2010
Online since
May 2010
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Price
$32.00
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