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Calcite Crystal

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 polarizers.
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Diameter max 30~40mm 
Length max 25~35mm 
Surface quality 20/10 scratch/dig 
Beam deviation < 3 arc min 
Optical axis orientation +/-0.5mm
Flatness λ/4 @632.8nm 
Transmission wavefront distortion <λ/2 @632.8nm 

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