For short fiber, the output laser power and slope efficiency can be improved when a reflective mirror is set at output end to reflect the pump light.
当光纤长度较短时，在输出端放置反射镜使泵浦光高反射，可以提高输出功率和效率。
Using variable reflective mirror, as a soft edge diaphragm, the intensity distributions of output laser are improved.
使用非均匀反射镜，可以起到软边光阑的作用，改善了输出光束的光场分布特性。
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