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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Stray light generated in optical system forms a lot of ghost images, which not only seriously influence the beam quality and propagation properties, but also damage optical components.

光学系统的杂散光极易在系统内形成多个鬼像，这不仅严重影响光束质量和传输特性，并可能对系统光学元件造成永久性损伤。

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Stray light generated in multi-pass amplification forms a lot of ghost images, which not only seriously influence the Laser beam quality and propagation p rope.

光学系统的杂散光极易在系统内形成多个鬼像 ，这不仅严重影响光束质量和传输特性 ，并可能对系统光学元件造成永久性损伤。

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