According to custom design to manufacture infrared windows, UV fused silica windows, CaF2 windows, ZnSe windows, Si windows,Sapphire windows, etc. Material: flint glass, UV fused silica, infrared fuses silica, CaF2, Ge, ZnSe, Si,Sapphire etc.Diameter: 4mm-- 100mmParallelism: lambda/10Surface quality: 40/20Clear Aperture: 90%Coating: custom designBesides, there are a large volume of stock optical components in various shapes and sizes to facilitate quick deliveries.