Zinc selenide (ZnSe) is a high-performance infrared optical material. It offers exceptionally high transmittance in the mid-wave and long-wave infrared regions, making it a core material for CO₂ laser optics and thermal imaging systems. Its most notable features are extremely high transmittance at the 10.6 μm wavelength, very low absorption coefficient, and low thermal lensing effect.
Extremely high transmittance at 10.6 μm
Non-hygroscopic with good environmental stability
Relatively soft and prone to scratching
| Transmission Range | 0.5 – 22 μm |
| Refractive Index | 2.4 @ 10 μm |
| Mohs Hardness | 2.5 |
| Uncoated Transmittance | ＞70% |
| Fracture Strength | 55 MPa |
