We analyzed the stray light source of 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。

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The Fourier transform characteristics of off-axis hololens was discussed, which was made by using a dot light source 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。

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Using laser He-Ne as light source, a image of the object is reconstructed in a system of parallel light.

再采用氦氖激光为光源，在平行光路系统中得到物体重建像；

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