We analyzed the stray lightsourceof system and drew a conclusion that non-image beam has great effect on system qualities and system ghost images caused by parallel Windows should not be ignored.
分析了系统杂散光的来源，得出非成像光束对系统影响较大、平板玻璃窗产生的鬼像不容忽视的结论。
2
The Fourier transform characteristics of off-axis hololens was discussed, which was made by using a dot lightsource and an inclined parallel light.
利用一点光源和一束倾斜平行光拍摄了一种离轴全息透镜，并对其傅里叶变换特性进行了分析。
3
Using laser He-Ne as lightsource, a image of the object is reconstructed in a system of parallellight.