N-BK7 Windows
Description:
BK7 window is the most common type of window. It has good performance over visible and near infrared wavelength region. BK7 window is ideal for applications require minimal transmitted beam deviation.
Specifications:
| Diameter (Φmm) | 10.0, 12.7, 15.0, 20.0, 25.4, 30.0, 38.1, 50.8 |
| Thickness (mm) | 2.0, 3.0, 6.0, 6.35 |
| Diameter Tolerance (mm) | +0.0/-0.2 (General), +0.0/-0.02 (High Precision) |
| Thickness Tolerance (mm) | ±0.2 (General), ±0.005 (High Precision) |
| Clear Aperture | >80% (Small Size), >95% (Large Size) |
| Parallelism | 3 min. (General), 3 sec. (High Precision) |
| Surface Quality: Scratch/Dig | 60/40 (General), 10/5 (High Precision) |
| Flatness (per 25mm@633nm) | λ/2(General), λ/10 (High Precision) |
| Bevel (face width x 45) | <0.25mm |
| Coating | Upon customer’s request |