Basic Characteristics
| Transparency Range | 350~2300nm |
| Partical Shape | Crystalline rhombohedra |
| Density | 2.7g/cm³ |
| Thermal Expansion Coefficient | Low susceptibility to moisture |
| Mohs Hardness | 3 |
| Thermal Expansion Coefficient | aa=24.39×10⁻⁶/k; ac=5.68×10⁻⁶/k |
| Crystal Class | Negative uniaxial with no=na=nb, ne=nc |
| Refractive index, birefringence(Δ=ne-no) and walk-off angle at 45℃(ρ) | no=1.6557,ne=1.4852 |
| Δn=-0.1705,ρ=6.20@630nm | |
| no=1.6629,ne=1.4885 | |
| Δn=-0.1705,ρ=6.20°@1300nm | |
| Sellmeier Equation | no² = 2.69705 + 0.0192064/(λ² - 0.01820) - 0.0151624λ² |
| ne² = 2.18438 + 0.0087309/(λ² - 0.01018) - 0.0024411λ² |
Processing Capability
| Conventional Precision Index | |
| Size | max. 45mm |
| Length | max. 35mm |
| Orientation Precision | +/-0.5° |
| Surface Finish | S/D 40-20 |
| Parallelism | <15 arc seconds |
| Perpendicularity | <10 arc minutes |
| Surface Form | < Lambda/8 @633nm |
| Wavefront Distortion | < Lambda/8 @633nm |
| Coating | According to customer requirements |
