Iceland spar (Calcite)
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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Overview
Specifications
| Parameter | Value |
|---|---|
| Size | max.30~45 |
| Length | max.25~35 |
| Surface Quality | 20/10 |
| Optical Deviation | <3 arc min |
| Optical Axis Orientation | +/-0.5 |
| Flatness [633nm] | <λ/4 |
| Wave Front [633nm] | <λ/4 |
| Coating | According to custmer request |
| Transparency Range | 350~2300 nm |
| Partical Shape | Crystalline rhombihedral |
| Density | 2.7 g/cm³ |
| Mohs Hardness | 3 |
| Thermal Expansion Coefficient aa | 24.39x10⁻⁶ |
| Thermal Expansion Coefficient ac | 5.68x10⁻⁶ |
| Crystal Class | Negative uniaxial with n_(o)=n_(a)=n_(b), n_(e)=n_(c) |
| Refractive index nₒ [630nm] | 1.6557 |
| Refractive index nₑ [630nm] | 1.4852 |
| birefringence Δn [630nm；Δ=nₑ-nₒ] | -0.1705 |
| walk-off angle ρ [630nm; Original header at 45℃] | 6.20 |
| Refractive index nₒ [1300nm] | 1.6629 |
| Refractive index nₑ [1300nm] | 1.4885 |
| birefringence Δn [1300nm；Δ=nₑ-nₒ] | -0.1705 |
| walk-off angle ρ [1300nm; Original header at 45℃] | 6.20 ° |
| Sellmeier Equation nₒ² | nₒ²=2.69705+0.0192064/(λ²-0.01820)-0.0151624λ² |
| Sellmeier Equation nₑ² | nₑ²=2.18438+0.0087309/(λ²-0.01018)-0.0024411λ² |
Datasheet
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