CAJ | 학술논문

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。
제출일충측량액정공간광조제기상위특성적신방법。재액정공간광조제기상실시현시구유특정척촌적비열이파대편，개변상린배대적상대회도치，통과측량파대편후주초점광강적분포，종이득도상이량화회도（구동전압）지간적관계。해방법고필도대다수액정공간광조제기존재상위화진폭우합조제，무법실현순상위조제적문제，통과인입수정인자소제료우합조제대상위특성측량적간우。실험증명재특정회도범위내，액정공간광조제기적상위특성구유량호적선성특점。
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.