BK7 Window are of high precision dimension control, minimal transmitted beam deviation, high surface quality.
With those excellent features, the BK7 window is widely use in projection optics systems, imaging and optical measurement system.
For your wide range of applications, ATE-DENMARK can supply varieties of single layer or multiplayer anti-reflecting coating on optical windows.
Please refer to Coatings chapter for more information.
| High Precision BK7 Window | |
| Specifications: | |
| Material | BK7 grade A optical glass or Chinese H-K9L |
| Diameter Tolerance | +0.00/-0.05mm |
| Thickness Tolerance | ±0.1mm |
| Clear Aperture | >Central 85% of diameter |
| Surface Quality | 20-10 S/D |
| Parallelism | Refer to the table |
| Wavefront Distortion | λ/10 per 25mm @632.8nm |
| Protective Bevel | <0.25mm x 45° |
| Coating | Uncoated |
| 1 min Parallelism | 10 sec Parallelism | φ(mm) | T(mm) |
| Part No. | Part No. | ||
| 10.0 | 6.0 | ||
| 12.7 | 6.0 | ||
| 25.0 | 6.0 | ||
| 25.4 | 6.0 | ||
| 30.0 | 6.0 | ||
| 50.0 | 10.0 |
| Standard BK7 Window | |
| Specifications: | |
| Material | BK7 grade A optical glass or Chinese H-K9L |
| Diameter Tolerance | +0.0/-0.1mm |
| Thickness Tolerance | ±0.1mm |
| Clear Aperture | >Central 85% of diameter |
| Surface Quality | 60-40 S/D |
| Parallelism | < 1 arc minute |
| Wavefront Distortion | λ/4 per 25mm @632.8nm |
| Protective Bevel | <0.25mm x 45° |
| Coating | Uncoated |
| Part No. | φ(mm) | T(mm) |
| 10.0 | 3.0 | |
| 12.jul | 3.0 | |
| 15.0 | 3.0 | |
| 25.0 | 3.0 | |
| 25.apr | 3.0 | |
| 30.0 | 3.0 | |
| 50.0 | 3.0 | |
| 50.8 | 3.0 |
Note:
Other sizes and coatings are available upon request.
Ultra Precision BK7 Window with λ/20 @632.8nm and Optical Flat are also available upon request.
The general tolerance specifications above provide a guideline regarding manufacturing capabilities for optics ranging in size from 1-600mm.
The manufacturing limits are not absolute; tighter tolerances may be possible.
Part specific tolerances may vary depending on component size, shape, and/or material.