Calcite (CaCO3) Crystal
Calcite is a natural birefringent material with good optical performance from the visible to the near infrared. It can be fabricated into relatively large components at an economical cost and is widely used in polarization and compensating components. Basic Properties. Fabrication Capabilities.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Transparency Range | 350~2300nm |
| Partical Shape | Crystalline rhombohedra |
| Density | 2.7g/cm³ |
| Thermal Expansion Coefficient | Low susceptibility to moisture |
| Mohs Hardness | 3 |
| Thermal Expansion Coefficient | aₐ=24.39x10⁻⁶/k; a_c=5.68x10⁻⁶/k |
| Crystal Class | Negative uniaxial with nₒ=nₐ=n_b, nₑ=n_c |
| Refractive index, birefringence(Δ=ne-no) and walk-off angle at 45℃(ρ) | nₒ=1.6557,nₑ=1.4852 |
| Refractive index, birefringence(Δ=ne-no) and walk-off angle at 45℃(ρ) | Δn=-0.1705,ρ=6.20@630nm |
| Refractive index, birefringence(Δ=ne-no) and walk-off angle at 45℃(ρ) | nₒ=1.6629,ne=1.4885 |
| Refractive index, birefringence(Δ=ne-no) and walk-off angle at 45℃(ρ) | Δn=-0.1705,ρ=6.20°@1300nm |
| Sellmeier Equation | nₒ²=2.69705+0.0192064/(λ²-0.01820)-0.0151624λ² |
| Sellmeier Equation | nₑ²=2.18438+0.0087309/(λ²-0.01018)-0.0024411λ² |
| Dimensions [Standard Precision] | max. 45mm |
| Length [Standard Precision] | max. 35mm |
| Orientation Accuracy [Standard Precision] | +/-0.5° |
| Surface Finish [Standard Precision] | S/D 40-20 |
| Parallelism [Standard Precision] | <15 arc seconds |
| Perpendicularity [Standard Precision] | <10 arc minutes |
| Surface Figure [Standard Precision; 633 nm] | < Lambda/8 @633nm |
| Wavefront Distortion [Standard Precision; 633 nm] | < Lambda/8 @633nm |
| Coating [Standard Precision] | According to Customer Requirements |
Applications
Datasheet
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Supplier Information
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