Calcite


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

 Capabilities: 

1) Diameter : max 30~40mm
 
2) Length: max 25~35mm
3) Surface Quality: better than 20/10 scratch/dig Per MIL-0-13830A
4) Beam Deviation: <3 arc minutes
5) Optical Axis Orientation: +/-0.5°
6) Flatness: < l/4 @633nm
7) Transimission Wavfront Distortion: < l/2 @633nm
8) Coating: upon customer's specification

Notes:
As the susceptibility is low so that it's easy to moisture,it's difficult to achieve excellent optical quality due to low hardness.

Physical and Optical Properties: 

Transparency Range 350~2300nm
Partical Shape Crystalline rhombihedral
Density 2.7 g/cm 3
Hygroscopic Susceptibility Low susceptibility to moisture
Mohs Hardness 3
Thermal Expansion Coefficient a=24.39x10 -6 /k; a c=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 45°C (ρ) o =1.6557, n e =1.4852 
Δn=-0.1705, ρ= 6.20° @ 630nm
o =1.6380, n e =1.4783
Δn =-0.1705, ρ= 6.20° @ 1300nm
Sellmeier Equation o 2 =2.69705+0.0192064/(λ 2 -0.01820)-0.0151624λ 
n e 2 =2.18438+0.0087309/(λ 2 -0.01018)-0.0024411λ 2

 

 

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