CALCITE
Description: Calcite is a natural crystal that has high birefringence and wide spectral transmission and available in reasonably sized rhombs. It is well known material for polarization optics. Ap..
ProductsOptical CrystalBirefringent CrystalCALCITE
CALCITE
Description:
Calcite is a natural crystal that has high birefringence and wide spectral transmission and available in reasonably sized rhombs. It is well known material for polarization optics.
Applications:
Negative uniaxial crystals and commonly used as visible and near IR polarizers.
Physical and Optical Properties:
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Transparency range
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350~2300nm
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Practical shape
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Crystalline Rhombihedral
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Density
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2.7 g/cm3
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Hygroscopic susceptibility
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Low susceptibility to moisture
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Hardness
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3 Mohs
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Thermal expansion coefficient
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αa=24.39x10-6/k; αc=5.68x10-6/k
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Crystal class
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Negative uniaxial with no=na=nb, ne=nc
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Refractive index, birefringence(Δ=ne-no) and walk-off angle at 45 (ρ)
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no =1.6557, ne=1.4852
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Δn=-0.1705, ρ= 6.20 o @ 630nm
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no =1.6629, ne =1.4885
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Δn=-0.1705, ρ= 6.20 o @ 1300nm
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Sellmeier equation
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no2=2.69705+0.0192064/(λ2-0.01820)-0.0151624λ2
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ne2=2.18438+0.0087309/(λ2-0.01018)-0.0024411λ2
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Specifications:
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Diameter
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max 30~40mm
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Length
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max 25~35mm
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Surface quality
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20/10 scratch/dig
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Beam deviation
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< 3 arc min
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Optical axis orientation
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+/-0.5
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Flatness
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λ/4 @633nm
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Transmission wavefront distortion
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<λ/2 @633nm
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Note: To inquire or order a finished Calcite crystal, please provide detailed specifications as listed in above.