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1. ZnSe is a preferred material for lenses, 2. low absorption at infared wavelengths, 3. visible transmission - details see: https://www.machineto.com/znse-material-10231093

ZnSe material

ZnSe is a preferred material for lenses, windows, output couplers and beam expanders for its low absorptivity at infrared wavelengths and its visible transmission. For high-power applications, it's critical that the material bulk absorption and internal defect structure be carefully controlled, that minimum-damage polishing technology be employed, and the highest quality optical thin-film coatings are used. The material absorption is verified by CO2 laser vacuum calorimetry.t. ZnSe optics are routinely polished from 5 to 300 mm in diameter. Sizes in 300 mm diameter and 25 mm thick are manufactured to customer requirements. ZnSe is non-hygroscopic and chemically stable, unless treated with strong acids. It's safe to use in most industrial, field, and laboratory environments.