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Product & Service |
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| CALCITE CRYSTAL RAW MATERIALS |
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| Calcite is a natural crystal that has high birefringence, wide spectral transmission and availability in reasonably sized rhombs. It's a negative uniaxial crystals and mostly used as visible, near IR, and also UV polarizers. We can provide a wide variety calcite crystals with guaranteed low price. We have unique technique to change yellow calcite to colorless, which will result in a 15%~20% increase in transmission below 420nm. |
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Transparency Range |
230～2300nm |
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Crystal Structure |
Rhombihedral |
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Density |
2.7g/cm3 |
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Hygroscopic Susceptibility |
Low susceptibility to moisture |
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Mohs Hardness |
3.0 |
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Thermal Expansion Coefficient |
α⊥=24.39x10-6/k; α‖=5.58x10-6/k |
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Crystal Class |
Negative uniaxial with no=na=nb, ne=nc |
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Refractive index, birefringence ( Δ=ne-no)
And walk-off angle at 45°C(ρ) |
no=1.6557, ne=1.4852
Δn=-0.1705, ρ=6.20°@630nm |
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no=1.6629, ne=1.4885
Δn=-0.1705, ρ=6.20°@1300nm |
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Sellmeier Equation |
no2=2.69705+0.0192064/(λ2-0.01820)-0.0151624λ2)
ne2=2.18438+0.0087309/(λ2-0.01018)-0.0024411λ2) |
Calcite Grades:
l Laser Grade: less than λ/10 peak-peak wavefront, distortion over the clear aperture and free of scatter when examined by He-Ne laser
l UV Grade: colorless material with high transmission in UV range and free of fluorescence under UV lamp
l Optical Grade: slight scatter when examined by He-Ne laser
l Standard Grade: wavefront distortion of less than one wave-peak-peak and many conspicuous scatter center when examined by He-Ne laser
Standard Size Catalog
<20x20x20mm (<25g)
>20x20x20mm (<70g)
>25x25x25mm (>70g)
>30x30x30mm (>100g)
>40x40x40mm (>200g)
>50x50x50mm (>400g)
>60x60x60mm (>600g)
>70x70x70mm (>1kg) |
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l National defence industry
l High precision optical components
l Big screen display equipment
l Refraction components
l Polarizer / polarimeter
l Prisms
l Photometer
l Saccharimeter
l Chromometer
l Rangekeeper / distance gage
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