液晶光学相控阵相位调制特性测量

Measurement of Phase Modulation Characteristics of Liquid Crystal Optical Phased Arrays

为了测试设计波长为1550nm的液晶光学相控阵在633nm波段的相位调制特性，采用泰曼格林干涉法和偏振光干涉法相结合的方法来进行测量。实验结果表明，液晶光学相控阵的相位延迟随灰度近似呈线性分布，在0-255的灰度范围内针对633nm激光的实际相位调制在O～3．767之间，在135～255的灰度范围内线性度良好，可以作为液晶的工作区域。由于液晶相位控制的准确性和精度是通过加载相应的灰度来实现的，因此测量相位延迟和灰度对应关系的研究对于液晶光学相控阵用于高精度光束偏转和跟踪有着重要价值。

In order to measure the phase modulation characteristics of 633 rim, the whose design wavelength is 1550 nm, the Tymann Green the liquid crystal optical phased array with interferometry combined with the polarized light interference methods are used. The experimental results show that the phase delay of the liquid crystal optical phased array is a linear distribution. In 0~ 255 gray-scale range for 633 nm, the actual phase modulation is 0~ 3.76n. The phase modulation characteristics have a good linearity in 135~255 gray-scale range. It can be used as the liquid crystal work area. Since the accuracy and precision of the liquid crystal phase control are depend the loading gray scale to achieve, so measuring the relation between the phase delay and gray has an important value in high precision light beam deflection and tracking for liquid crystal optical phased array.