类型
金属反射镜，介质膜反射镜
材料
H-K9L,Fused Silica等光学玻璃材料
| Specification | Normal | Precision |
| Diameter Tolerance | 0.0,-0.2mm | 0.0,-0.01mm |
| Thickness Tolerance | ±0.2mm | ±0.05mm |
| Parallelism | ＜3 arc min | ＜1 arc sec |
| Surface Flatness | λ@632.8nm | λ/10@632.8nm |
| Clear Aperture | >90% | >100% |
| Surface Quality | 60-40 S/D | 20-10 S/D |
