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 Calcite is a negative uniaxial crystal that has high birefringence, wide spectral transmission and availability in reasonably sized rhombs. Although is a fairly soft crystal and is easily scratched, it is ideal material used as visible and near IR polarizers, such as Glan Taylor, Glan Thompson and Glan laser.
Orientation: < 111 > +/-5deg
Diameter Tolerance : +0.0 /-0.1mm
Thickness Tolerance: +/-0.2mm
Surface Quality: better than 10/5 scratch/dig
Parallelism: < 30 arcsec
Flatness: < λ/8 @632.8nm
Perpendicularity: < 5 arcmin
Wavefront Distortion: < λ/2 @632.8nm
Coating: Coating upon Request

Crystal Structure Cubic
Density 4.5 g/cm3
Transmission Range 250 - 5000 nm
Melting Point 1970 °C
Specific Heat 0.59 W·s /g /K
Thermal Conductivity 14 W/m /K
Thermal Shock Resistance 790 W /m
Thermal Expansion 6.9x10-6 /K
dn/dT, @ 633nm 7.3x10-6 /K-1
Mohs Hardness ~ 8.5
Refractive Index 1.8245 @ 0.8mm, 1.8197 @ 1.0mm,
1.8121 @ 1.4mm