同时采用CVD硒化锌，可以透射可见光并承受大功率。
We use CVD ZnSe through which the visible light can go through and by which the expander can bear larger power.
由于采用硒化锌、硫化锌或锗材料并镀有优化设计的薄膜，合束镜通常透射红外光，反射可见光。
Since applying ZnSe, ZnS or Ge and coating with optimized layer, the beam-combination mirrors usually transmit infrared lights and reflect visible lights.
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