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Calcite (CaCO3)

Calcite is a natural crystal that has high birefringence and wide spectral transmission and available in reasonably sized rhombs. It is a negative uniaxial crystals and commonly used as visible and near IR polarizer.

Physical and Optical Properties:

Transparency range

350~2300nm

Structure

rhombihedral

Density

2.7 g/cm3

Hygroscopic susceptibility

Low susceptibility to moisture

Mohs Hardness

3

Thermal expansion coefficient

αa=24.39x10-6/k; αc=5.68x10-6/k

Refractive index, birefringence(Δ=ne-no) and walk-off angle at 45o(ρ)

no =1.6557, ne=1.4852, Δn=-0.1705, ρ= 6.20o@ 630nm

no =1.6629, ne =1.4885, Δn=-0.1705, ρ= 6.20o@ 1300nm

Sellmeier equation (l in mm)

no2=2.69705+0.0192064/(l2-0.01820)-0.0151624l2
ne2=2.18438+0.0087309/(
l2-0.01018)-0.0024411l2

Specifications:

Diameter

max 30~40mm

Length

max 25~35mm

S/D

20/10

Beam deviation

< 3 arc min

Optical axis orientation

+/-0.5

Flatness

l/4 @632.8nm

Transmission wavefront distortion

<l/2 @632.8nm

Coating

Upon request

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