Zinc selenide (ZnSe) material has a very good light transmission performance, through the band width (500nm-22 μ m), and is usually used as a substrate material in high-power CO2 laser systems for reflecting mirrors and beam-splitting mirrors. At the same time, because of the good refractive index uniformity and consistency of zinc selenide material, so it is widely used in thermal imaging system, medicine, industrial thermal radiation spectrometer and infrared spectrometer window and lens.