Achromatic system for a twisted alignment liquid crystal wavefront corrector

Discontinued Devices LC-R 2500 Spatial Light Modulators
Adaptive Optics / Wavefront Control
Published on:
Authors: Zhaoliang Cao, Quanquan Mu, Lifa Hu, Yonggang Liu, Zenghui Peng, Xinghai Lu, and Li Xuan
Abstract:
“A twisted nematic liquid crystal wavefront corrector (TN-LCWFC) partially modulates the incident polarized light. A blazed grating may be preapplied on the TN-LCWFC to filter the unmodulated light for the purpose of stable adaptive correction. However, for broadband light, the dispersion of the blazed grating affects the image resolution. An achromatic method is presented to eliminate the dispersion of the blazed grating. Based on a prism model, we analyze the achromatic principle. An achromatic system with a conjugated blazed grating and an achromatic lens is given to eliminate the dispersion. An experiment was done with two transmitted blazed gratings so as to validate our method. Finally, a liquid crystal spatial light modulator was used as a conjugated grating to eliminate the dispersion of the blazed grating in an adaptive optics system. The results showed that the dispersion was partially compensated, and a resolvable image was achieved with a 600-700 nm wave band.”

Restricted Access

Publication: Applied Optics
Issue/Year: Applied Optics, Vol. 47, Issue 8, pp. 1020-1024 , 2008
DOI: 10.1364/AO.47.001020
Link: https://doi.org/10.1364/AO.47.001020

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