The generalized phase modulation optimization method for LCOS with an arbitrary twisted angle used in wave-front correction

LIU Yongjun; HU Lifa

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The generalized phase modulation optimization method for LCOS with an arbitrary twisted angle used in wave-front correction

LIU Yongjun 1 * #,HU Lifa 2

1.Harbin Engineering University

2.State Key Laboratory of Applied Optics , Changchun Institute of Optics , Fine Mechanics and Physics ,Chinese Academy of Sciences , Changchun 130033, China

*Correspondence author

#Submitted by

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Funding: Supported by Research Fund for the Doctoral Program of Higher Education of China（No.200802171034）, Supported by National Natural Science Foundation of China（No.61107059 ）

Opened online:14 September 2011

Accepted by: none

Citation: LIU Yongjun,HU Lifa.The generalized phase modulation optimization method for LCOS with an arbitrary twisted angle used in wave-front correction[OL]. [14 September 2011] http://en.paper.edu.cn/en_releasepaper/content/4442370

Based on the 2×2 Jones matrix method, we investigated theoretically the phase modulation characteristics of a reflective liquid crystal on silicon (LCOS) device with any twisted angles. The optimized range of phase-only modulation was obtained with the reflectivity variation lower than 10%. In addition, phase modulation characteristic of the LCOS with the 45-degree's LC twisted angle on a Zygo interferometer was presented. Based on the optimized phase modulation result for the LCOS, the experiment of the real-time closed loop correction for the dynamic aberrated wave-front was conducted to validate our theoretical simulation. The results show that on the area of 19.5 mm×14.6mm the peak to valley (PV) value is up to 0.082λ, RMS up to 0.015λ, and the closed loop bandwidth is 4Hz.

Keywords:adaptive optics; liquid crystal; LCOS

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