Windows act as transparent protective Windows, allowing light from one environment to enter a different one
The environment, such as different temperatures, pressures, chemical compositions or cleanliness levels, can all affect its light projection.
BK7 window plate is a name given by German SHOTT, and the corresponding domestic brand is Chengdu Guangming
The properties of K9 glass are basically the same. Its refractive index is 1.51680 and its acid resistance is 1K
The rockwell hardness is 610, so many customers who have requirements for imaging and light refraction mostly choose BK7
As a window. However, its transmittance is only 92%, so customers will require coating to achieve high transmittance and low transmittance
Refraction allows as much light as possible to pass through.
| Substrate | BK7 | Surface Accuracy | λ/4@632.8nm |
|---|---|---|---|
| Surface Finish | 60 – 40 | Outside Diameter Tolerance | -0.05mm |
| Thickness Tolerance | ±0.05 | Parallelism | 3′ |
| Protective Edge Chamfer | 0.1 – 0.5mm*45° | Clear Aperture | ＞95% |
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