Windows: BK7 | Fused Silica | Sapphire | CaF2 | MgF2
Windows
Windows are used to isolate different physical environments while allowing light to pass. When selecting windows you should consider materials, transmission, scattering, wavefront distortion, parallelism and resistance to certain environment. CASIX offers a wide range of different materials and different degree of precision windows. Special materials are available upon requirement.
CASIX provides varieties of single layer or multilayer anti-reflecting coating on optical windows. Please refer to coating chapter for more infomation.
Window
Materials Properties:
| Material | Properties | Application |
|---|---|---|
| BK7 | Transmission Range: 330-2100nm Refractive Index: 1.5164@588nm |
Good performance over visible and near IR spectrum for most application. |
| Fused Silica | Transmission Range: 185-2500nm Refractive Index: 1.4858@308nm Low Thermal Expansion Coefficient: 0.54 x 10-6K |
Better performance from UV to IR spectrum. Also, it is the best choice for resistance thermal application. |
| Sapphire | Transmission Range: 180-4500nm Refractive Index: 1.755@1000nm Strong Hardness |
Suit for scratch resistance application with better transmission over the wide range spectrum. It can be made much thinner. |
| Calcium Fluoride | Transmission Range: 170-7800nm Refractive Index: 1.399@ 5000nm Little Hygroscopic Susceptibility High Thermal Expansion Coefficient: 18.85 x 10-6K |
It is applicable for wide rang spectrum, and it is particularly useful for excimer laser application. |
Magnesium
Fluoride |
Transmission
Range: 120-7000nm Refractive Index: 1.376@700nm |
It is applicable for wide range spectrum, and it is particularly useful for Excimer laser application. |