Zinc Selenide (ZnSE) vs. Gallium Arsenide (GaAs) For Your Lens

Posted by Ana Walters on

Zinc Selenide (ZnSE) is the best material for infrared optics. However, the quality of ZnSE in China is very unpredictable.

Gallium Arsenide (GaAs) has a more consistent quality in China as a raw material.  However, it is not as good as ZnSe, but it always beats bad bad ZnSe.

There are 2 types of ZnSe.

  • CVD ZnSe (Chemical Vapor Deposition) is a process where the environment is maintained in a reactor to promote ZnSe crystal growth. 
  • PVD ZnSe (Physical Vapor Deposition) is a process where ZnSe scraps are evaporated and then recombine into a solid.  PVD ZnSe has legitimate practical purposes, but Co2 laser optics is not one of them.

CVD ZnSe is only made in the USA.

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