Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO3).It's a negative uniaxial crystal and mostly used as visible and near IR polarizers. It has high birefringence,..
Calcite Birefringent Crystal
Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO3).It’s a negative uniaxial crystal and mostly used as visible and near IR polarizers. It has high birefringence, wide spectral transmission and availability in reasonably sized rhombs. Specifications:
| Size: | max.30~45mm |
| Length: | max.25~35mm |
| Surface Quality: | 20/10 |
| Optical Deviation: | <3 arc min |
| Optical Axis Orientation: | +/-0.5° |
| Flatness: | < λ/4 @633nm |
| Wave Front: | < λ/4 @633nm |
| Coating: | According to custmer request |
Physical Properties:
| Transparency Range | 350~2300nm |
| Partical Shape | Crystalline rhombihedral |
| 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 |