According to custom design to manufacture infrared windows, UV fused silica windows, CaF2 windows, ZnSe windows, Si windows, etc. 

Material: flint glass, UV fused silica, infrared fuses silica, CaF2, Ge, ZnSe, Si, etc.

Diameter: 4mm-- 100mm

Parallelism: <30" 

Surface accuracy: > λ/10

Surface quality: 40/20

Clear Aperture: 90%

Coating: custom design