Because of its low absorption coefficient and high thermal expansion coefficient, ZNSE is usually used in high power CO2 laser system as the base material of the reflector and beam splitter. But because ZNSE is relatively soft (nu's hardness is 120), it is easy to wipe the flowers, so it is not recommended for the harsh environment. In hand and cleaning, we should pay attention to the force evenly, preferably with finger sleeve or glove. The diameter range of the ZNSE window or lens produced by our company is: 5~220mm, the surface precision is up to 20/10, and the surface roughness is up to: lambda /10@633nm (the ratio of the thickness to diameter of the lens should conform to the processing ratio).