1、What are laser windows? Laser Protect Windows(Laser protective glass, protective filters or welding protective windows) are used to save for the high cost of laser optics. 2、What are laser windows used for? These windows are normally used in applications like laser cutting, laser welding machine, they are used for avoiding the high-precision laser optics damage by material splashes. 3、The key features of UNI Optics' Laser Windows High Transmission High Damage Threshold Low Scatter Low Absorption Excellent Film Density Excellent Environmental Stability     Typical Specifications:   Dimension: 4mm-80mm, round or square Material: BK7, Fused Silica, ZnSe...etc Surface quality: 10/5 Surface flatness: Lambda/10@632.8nm Parallelism: 30’’ Roughness: 3A