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Calcite is a naturally occuring negative uniaxial crystal that exhibits high birefringence and a wide spectral transmission range. Although cutting and polishing calcite are challenging due to its softness, it is a widely used material for visible and near IR polarizers, such as Glan Taylor, Glan Thompson and Glan laser.
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Transparency Range (nm) |
350~2300
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Crystal Symmetry Class |
Trigonal-Rhombohedral, D3d
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Crystal Class |
Negative Uniaxial
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Hygroscopic Susceptibility |
Low Susceptibility to Moisture
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Coefficient of Thermal Expansion (/°K)
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||C: 5.68X10-6
⊥C: 24.39X10-6 |
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Refractive Indices |
no=1.6557, ne=1.4853 at 630nm
no=1.6629, ne=1.4885 at 1300nm
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Sellmeier Equation (λ in um) |
no2=2.69705+0.0192064/(λ2-0.01820)+0.0151624·λ2
ne2=2.18438+0.0087309/(λ2-0.01018)+0.0024411·λ2
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Density (g/cm3) |
2.71
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Mohs Hardness |
3
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Table 1: Calcite Physical and Optical Properties
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