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。
2
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.
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.