具有可变电控光栅常数的液晶光栅

针对现有液晶光栅器件存在的光栅常数不能变化、电极尖端放电、边缘效应等缺点,设计了一种可转换光栅常数的液晶光栅。通过控制不同导电区的通断电,使液晶光栅不同区域产生透光与不透光,实现光栅常数的转换;液晶光栅梳状电极端部的圆弧状设计,避免了尖端放电现象,减小了边缘效应的影响。以He-Ne激光为光源,用WGD-8A型组合式多功能光栅光谱仪对所设计的液晶光栅器件进行了测量,结果表明：通过控制导电区的变化实现了光栅常数的转变,在2～3.4 V电压驱动下,具有3种不同光栅常数的液晶光栅的1级衍射光强逐渐增强,且其衍射光强的差值不断增大,达到了预期设计目的。设计的液晶光栅在视差栅栏、光栅尺等方面有好的应用前景。

Liquid crystal grating with variable and electrically controlled constants

A liquid crystal grating（LCG） with viriable grating constants is designed to make up for the shortcomings of existing gratings,such as fixed grating constant,electrode tip discharge and the electrode edge effect,et al.As a bias is applied to different conducting regions by a control module,the local transmittance is variable and location dependent,which may achieve the transition of grating constant.In addition,the arc-shape design for honeycomb electrode can efficiently avoid the point discharge near the tip and can reduce right-angle shape effect on the deflection texture.The LCG is tested by a WGD-8A grating multi-function analyzer with a He-Ne laser as the light source.The experimental results indicate that the grating constant can be changed by the control module.With the driving voltages of 2-3.4 V,the first order diffractive intensities and their difference values of the liquid crystal grating with three different grating constants increase gradually.This type of LCG can be wildly applied in many devices,such as parallax barriers and grating rulers,which are significant for the application and development of LCGs.