Window

Window


Windows are used to enable optical radiation to pass from one environment to another without allowing the environments to mix. materials, transmission, scattering, wavefront distortion, and resistance to certain environments should be considered when selecting windows.


Raw material  

Material Transmission Range Refractive Index
N-BK7 330-2100nm 1.5164@588nm
Fused Silica 185-2500nm 1.4858@308nm
Crystal Quartz 180-3500nm
(also>40μm)
no =1.5350
ne =1.5438@1μm 
Sapphire 180-4500nm 1.755@1000nm
CaF2 170-7800nm 1.399@5000nm
MgF2 120-7000nm 1.376@700nm
Germanium 2-20μm 4.005@10.6μm
Silicon 1.2-7μm 3.4223@ 5μm
ZnSe 0.5-22μm 2.44@2.75μm
ZnS 8-14μm 2.223@8μm