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/cm³
Hygroscopic Susceptibility	Low susceptibility to moisture
Mohs Hardness	3
Thermal Expansion Coefficient	a _a=24.39x10 ^-6/k; a_c=5.68x10 ^-6 /k
Crystal Class	Negative uniaxial with n_o=n_a=n_b, n_e=n_c
Refractive index, birefringence(Δ=ne-no) and walk-off angle at 45°C (ρ)	n _o =1.6557, n _e =1.4852 Δn=-0.1705, ρ= 6.20° @ 630nm
	n _o =1.6380, n e =1.4783 Δn =-0.1705, ρ= 6.20° @ 1300nm
Sellmeier Equation	n _o²=2.69705+0.0192064/(λ ² -0.01820)-0.0151624λ ²n e ² =2.18438+0.0087309/(λ ² -0.01018)-0.0024411λ ²

α-BBO

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