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液晶波前校正器位相调制非线性及闭环校正研究

ISSN号：1007-2780
期刊名称：《液晶与显示》
时间：0
分类：O753.2[理学—晶体学] TH74[机械工程—光学工程;机械工程—仪器科学与技术;机械工程—精密仪器及机械]
作者机构：[1]中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室,吉林长春130033, [2]中国科学院研究生院,北京100039
相关基金：国家自然科学基金（No.60736042,No.60578035,No.50473040）

作者：曹召良[1,2], 穆全全[1,2], 胡立发[1], 彭增辉[1], 刘永刚[1], 宣丽[1]

关键词：液晶波前校正器, 位相调制, 非线性, 闭环校正, liquid crystal wavefront corrector, phase modulation, nonlinearity, closed loop correction

中文摘要：

研究了液晶波前校正器位相调制曲线非线性的校正以及液晶自适应闭环对畸变波前的校正。利用液晶显示器领域通用的Gamma校正技术实现对液晶波前校正器非线性的校正。首先，通过施加线性的LUT曲线以获得512个LUT值对应的位相调制量。然后通过对一个波长位相调制量的线性化分割，找到能够获得线性位相调制的LUT函数曲线。最后将该优化曲线写入液晶波前校正器的驱动电路板中，再次驱动液晶波前校正器并利用ZYGO干涉仪测量位相调制和灰度级的关系，得到了线性的位相调制。利用线性的液晶波前校正器结合哈特曼波前探测器和波前控制器进行了自适应闭环校正研究。校正前，PV和RMS的平均值分别为2．5λ和0．48λ；经过闭环自适应校正，PV和RMS的平均值分别下降为λ／11和λ／62。分辨率板的一级像也由模糊变得清晰。实验结果说明，经过线性化的液晶波前校正器可以获得高校正精度。

英文摘要：

The correction of the nonlinearity of the liquid crystal wavefront corrector and the closed loop correction were investigated. The Gamma correction technique was used to correct the nonlinearity of the liquid crystal wavefront corrector. First, the relation between the phase modulation and the LUT value was measured with the linear LUT curve. Then, the optimal LUT curve was obtained by equally divide the phase modulation curve with 1λ. At last, this optimal LUT curve was written into the driving board of the liquid crystal wavefront corrector. The liquid crystal wavefront corre.ctor was driven again and the ZYGO interferometer was used to measure the relation between the phase modulation and the grey level. The measured result showed that it is a linear curve. An adaptive correction experiment was done with the optimal liquid crystal wavefront corrector, Hartmann wavefront sensor and the controller. Before correction, the averaged PV and RMS of the wavefront were 2.5λ and 0.48λ respectively. While the closed loop correction was done, the averaged PV and RMS of the wavefront are down to λ/11 and λ/62 respectively. The first order image of the resolution target became resolvable. These results indicated that the high correction accuracy may be acquired with the optimal liquid crystal wavefront corrector.

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