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- Most sizes λ /20 transmitted wavefront, 10-5 surface quality
- All kinds of coatings are available
- Custom designs for other sizes and coatings are also available upon request
| Material | BK7 or UV fused silica |
| Diameter Tolerance | +0/-0.15mm |
| Thickness Tolerance | ±0.25mm |
| Clear Aperture | ＞Central 85% of diameter |
| Parallelism | ＜5″ |
| Surface Quality | 20/10 |
| Transmitted Wavefront | λ/10 @632.8nm |
| Brewster Angle (θ) | 56.6° @588nm（BK7）
56.1° @308nm（UVFS） |
| Chamfers | ＜0.35mm face width ×45° |
