| Grating Disk | |
| Technical Requirements | Tolerance Range |
| Size range | 5-200mm |
| Diameter tolerance | 0/-0.05mm |
| Thickness tolerance | ±0.02mm |
| Parallelism tolerance | ±2“-±10” |
| Surface Quality | 10-20 |
| Surface accuracy | 1/5λ |
| Edge | 0.1-0.5mm |
| Meterial | All kinds of colored, colorless optical glass |