Jinan Crystrong Photoelectric Technology Co.,Ltd
UNITY DILIGENCE REFINEMENT INNOVATION
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BK7 Window High Thermal Expansion Coefficient For Optical System
Windows are widely used on optical system. There can be extreme differences of temperature, pressure, humidity and other parameters on either side of the window. The optical, mechanical and thermal properties of windows including BK7 windows. Fused silica windows,CaF2 windows, Sapphire windows.
Mirror are designed for visible light; however, mirrors designed for other types of waves or other wavelength or electromagnetic radiation are also used. Especially in non-optical instruments.
Product description:
The window is made from BK7 material, which has transparent range from 330-2100nm. The refractive index is 1.5164 at 588nm. The BK7window has good performance over visible and near IR spectrum for most application.
Specification:
| Material | BK7 |
| Diameter tolerance | +0.0-0,1mm |
| Thickness tolerance | ±0.1mm |
| Clear aperture | ＞85% |
| Parallelism | 1 '(Standard),10/5(High Precision) |
| Surface quality | 60/40(standard),10/5(high precision) |
| Wave front distortion | 1/4 @633nm |
| Bevel | ＜0.25mmx45° |
| coating | uncoated |