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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
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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.

Calcite specification or based on clients' requirements


Material:

Domestic or foreign materials are selected based on clients' requests

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=24.39x10-6/k; ac=5.68x10-6/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