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Calcite is a carbonate mineral and the most stable calcium carbonate (CaCO3). It is a negative uniaxial crystal and is mainly used in visible and near-infrared polarizers. Its rhombohedron has high birefringence and broad spectral transmission characteristics.
Introduction：
Calcite is a carbonate mineral and the most stable calcium carbonate (CaCO3). It is a negative uniaxial crystal and is mainly used in visible and near-infrared polarizers. Its rhombohedron has high birefringence and broad spectral transmission characteristics.
Shenhua offers CaCO3 specifications：
Dimension Tolerance | (W±0.1mm)x(H±0.1mm)x(L±0.1mm) (L≥2.5mm) |
Angle Tolerance | △θ≤±0.2°,△φ≤±0.2° |
Wavefront distortion | ≤ λ/8 @ 633nm |
Flatness | ≤ λ/10 @ 633nm |
Parallelism | 20’’ |
Perpendicularity | 5 ’ |
Clear Aperture | Central 90% of the diameter |
Surface Quality | 10/5 to MIL-PRF-13830B |
Chamfer | ≤0.3mm x 45° |
Coating | AR coating or upon customer’s request |
Quality Warranty Period | One year under proper use |
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