我们设计的实验光路如图1所示。S为白光光源,被记录资料为O(x0,y0)。LCLV是混合场效应液晶光阀,透镜L_1将物之像I(x,y)成于光阀光导层OdS膜上,当满足液晶层电压〉液晶阈值电压时,就能使光导层与液晶上形成与写入光图像相对应的电压像。激光LA在BS_1上分束,一束作参考光,一束经K扩束后经L_2会聚并经P_1起偏,在BS_2上反射再经L_3成平行光照射LCLV并被返回,返回光受到液晶上电压像的调制,再经P_2检偏后得到与写入图像相对应的相干光图像O’(x’,y’)。O’(x’,y’)就是傅里叶变换光路中的物像。调节加在LCLV上的电压和频率,可得到O’(x’,y’)与O’(x,y)成线性关系:O’(x’,y’)=αO(x,y)。L_3是傅里叶变换透镜,P为其谱面处,谱面分布为 We design the experimental light path shown in Figure 1. S is a white light source, the recorded data is O (x0, y0). LCLV is a mixed field effect liquid crystal light valve. The lens L_1 forms an object image I (x, y) on the light guide layer OdS film. When the voltage of the liquid crystal layer is greater than the liquid crystal threshold voltage, the light guide layer and the liquid crystal A voltage image corresponding to the written light image is formed. Laser beam LA is split on BS_1, one beam is used as reference beam, one beam is converged by L_2 and P_1 is polarized by K beam expander, then reflected by BS_2 and then is returned to LCLV by L_3 parallel light, and the returned light is reflected by liquid crystal The modulation of the voltage image is followed by the P 2 bias to obtain the coherent light image O ’(x’, y ’) corresponding to the written image. O ’(x’, y ’) is the object image in the Fourier transform optical path. Adjusting the voltage and frequency applied to the LCLV yields a linear relationship between O ’(x’, y ’) and O’ (x, y): O ’(x’, y ’) = αO (x, y). L_3 is a Fourier transform lens, P is its spectral surface, spectral distribution is