The Window is made from BK7 material, which has transparent range from 330-2100nm. The refractive index is 1.5164 at 588nm. The BK7 window has good performance over visible and near IR spectrum for most application.
Specifications:
| Material: | BK7 |
| Diameter Tolerance: | +0.0, -0.1mm |
| Thickness Tolerance: | ± 0.2mm |
| Clear Aperture: | >80% |
| Parallelism: | 1'(Standard), 10"(High Precision) |
| Surface Quality: | 60/40(Standard), 10/5(High Precision) |
| Wavefront Distortion: | l(Standard), l/10(High Precision) per 25mm @632.8nm |
| Bevel: | <0.25mm X 45° |
| Coating: | Uncoated |
