Calcite

  • Calcite Crystal
  • 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,..

Calcite Birefringent Crystal

CalciteCalcite 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 Range350~2300nm
Partical ShapeCrystalline rhombihedral
Density2.7g/cm3
Thermal Expansion CoefficientLow susceptibility to moisture
Mohs Hardness3
Thermal Expansion Coefficientaa=24.39×10-6/k; ac=5.68×10-6/k
Crystal ClassNegative 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 Equationno2=2.69705+0.0192064/(λ2-0.01820)-0.0151624λ2
ne2=2.18438+0.0087309/(λ2-0.01018)-0.0024411λ2