K9 Special shaped
Density：2.51g/cm^3
Transmission：≥92%@546.1nm
Homogeneity：±(2-5)×10^-6
Stress birefringence：2-10nm/cm
| Size | Diagonal | Dia.-Thick Ratio | Radius of curvature | Opening angle | ΔR | Surface Quality S/D | Flatness | ETV |
| Small | 10-25mm | 5:1 | ≥35mm | ≤60° | A | 20-10 | N≤2Δ N≤0.5 | 0.05 |
| Medium | 25-100mm | 5:1 | ≥35mm | ≤60° | A | 20-10 | N≤2/φ60mm ΔN≤0.5/φ60mm | 0.05 |
| Large | 100-295mm | 5:1 | ≥120mm | ≤60° | A | 40-20 | N≤2/φ60mm ΔN≤0.5/φ60mm | 0.05 |
