利用菲涅尔波带片测量LC-SLM相位特性  

Measuring LCSLM's phase-modulation characteristics based on Fresnel zone plate

作　　者：朱爱敏[1] 范君柳[1] 

机构地区：[1]苏州科技学院数理学院,江苏苏州215009

出　　处：《激光杂志》2012年第6期18-19,共2页Laser Journal

基　　金：苏州科技学院教学质量工程(2010TDX-06)

摘　　要：提出一种测量液晶空间光调制器相位特性的新方法。在液晶空间光调制器上实时显示具有特定尺寸的菲涅尔波带片,改变相邻环带的相对灰度值,通过测量波带片后主焦点光强的分布,从而得到相移量和灰度(驱动电压)之间的关系。该方法考虑到大多数液晶空间光调制器存在相位和振幅耦合调制,无法实现纯相位调制的问题,通过引入修正因子消除了耦合调制对相位特性测量的干扰。实验证明在特定灰度范围内,液晶空间光调制器的相位特性具有良好的线性特点。A new method of measuring phase- modulation characteristics of liquid crystal spatial light modulator is proposed. By displaying a Fresnel zone plate with a specific size on LC - SLM, we obtain the relation between relative phase shift and gray scale through changing relative gray scales of Fresnel zone plate＇ s neighboring strips and measuring the main focusing intensity. By introducing the correcting factor, the method is a good way to solve the disturbance caused by coupling modulation of phase and amplitude which characterizes most LC - SLMs. Experimental results show that the LC - SLM has good linear properties within certain gray scales.

关 键 词：液晶空间光调制器 相位调制 菲涅尔波带片 耦合调制 

分 类 号：O438[机械工程—光学工程]