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Calcite

Calcite is a negative uniaxial crystal that has high birefringence, wide spectral transmission and availability in reasonably sized rhombs. It is used as visible and near IR polarizers.

Basic Properties:
    Transparency Range:
    350nm - 2300nm
    Mohs Hardness:
    3
    Hygroscopic Susceptibility:
    Low
    Thermal Expansion Coefficient
    aa =24.39 x 10-6/K;       ac = 5.68 x 10-6/K
    Refractive Indices, Birefringence
    ( Δn = ne - no ) and Walk-off
    Angle at 45°( r ):
    0.63mm no=1.6557, ne=1.4852, Δn=-0.1705, r=6.20°
    1.30mm no=1.6629, ne=1.4885, Δn=-0.1744, r=6.32°
    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
Main Specifications:
    Surface Quality:
    20/10 Scratch and Dig
    Beam Deviation:
    <2 arc min
    o and e Beam Angle:
    <90 arc secondes
    Orientation:
    ±0.5°
    Flatness:
    λ/4 @ 632.8 nm
    Transmission Wavefront Distortion:
    <λ/2 @632.8 nm
    AR-coating:
    R<0.5%
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