ANALYSIS OF THE GENERAL EFFECTS IN DOUBLE-GRATING DIFFRACTION-INTERFERENCE SYSTEM

Based on the ambiguity function, the optical phenomena of the double-gearing diffraction-interference system are analysed with partially coherent illumination. Different patterns are observed on the observation plane when the optical elements are placed in their proper positions. Detailed discussions on the two extremes of coherence are given. Conclusions could be obtained about the Lau effect, the generalized Lau effect, the incoherent grating-lens imaging, the Talbot effect, the joint-Talbot effect and the generalized joint-Talbot effect. Some special cases are also verified by experiments.     

双轴晶体中三波相互作用时的最佳相位匹配问题

本文论述了双轴晶体中和频、差频、参量振荡、参量放大等各种三波相互作用过程时相位匹配曲线及有效非线性系数的数值计算方法.从而只要知道某种双轴晶体对相应波长的主折射率及非线性系数后,便可求得最佳相位匹配角θ_(OPM)和φ_(OPM).本文报导了对六种双轴晶体的计算结果和对二种双轴晶体的实验情况.实验结果与计算结果十分一致.     

方位调制相位光栅Lau效应理论及实验研究

本文根据部分相干理论研究了方波调制相应光栅的Lau效应,在实验中观察到了理论所预言的高对比度Lau条纹.     

光栅投影图像测量物体三维外形

使用投影光栅技术 ,由 Computer TV Camera得到待测物体表面和一参考平面的变形投影条纹图像 ,通过比较投影光强和在两幅图像的分布位置对应关系 ,非接触测量物体表面三维外形 ,给出了测量原理和石膏头像脸部表面三维外形测量结果 ,分辨率为 0 .0 6 mm