Calcite Crystal

Crystals >>> Birefrigent Crystals >>> 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.

Red Optronics supplies a wide variety finished Calcite crystals.  Our standard Calcite crystals specification follows:

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

To inquire or order a finished Calcite crystal, please provide detailed specifications as listed in above. 

Physical and Optical Properties  
Transparency range 350~2300nm
Partical shape Crystalline rhombihedral
Density 2.7 g/cm3
Hygroscopic susceptibility Low susceptibility to moisture
Hardness 3 Mohs 
Thermal expansion coefficient αa=24.39x10-6/k; αc=5.68x10-6/k
Crystal class Negative uniaxial with no=na=nb, ne=nc
Refractive index, birefringence(Δ=ne-no) and walk-off angle at 45C(ρ) no =1.6557, ne=1.4852
Δn=-0.1705, ρ= 6.20 @ 630nm
no =1.6629, ne =1.4885
Δn=-0.1705, ρ= 6.20 @ 1300nm
Sellmeier equation no2=2.69705+0.0192064/(λ2-0.01820)-0.0151624λ2


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