| Specification | |
| Material: | BK7, Fused Silica, Borofloat etc. Glass |
| Dimension Tolerance: | +0.2, -0.2mm |
| Thickness Tolerance: | ±0.2mm |
| Surface quality: | 60/40 |
| Clear Aperture: | >85% |
| Flatness: | λ/4 per 25mm@633nm |
| Parallelism: | ±1' |
| Bevel: | <0.25mm X 45° |
| Coating: | Laser line (Extinction Ratio 500:1) ,AOI= 45°: |
| Tp>96% and Ts<0.2% | |
| Rp<4% and Rs>99.7% |