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Materials>Crystals>Calcite Crystal

Si CaF2 Quartz KTP YAG Sapphire Lithium Niobate
Ge MgF2 Calcite ZnSe YVO4 Birefringent
Calcite Crystal
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 Golan Taylor, Golan Thompson and Golan laser.
AZURE selects carefully the raw calcite crystals by inspecting them with a cw green laser beam. We have perfected a number of proprietary processes for cutting, grinding and polishing good quality optical surfaces for calcite prism. These skills are evident in the high quality of the finished components, and enable polarizers to be used with very high peak power lasers.
1.Basic Properties of Calcite crystals
Transparency Range: 350nm - 2300nm
Particle Shape: Crystalline Rhombihedral
Density: 2.7 g/cm3
Hygroscopic Susceptibility: low susceptibility to moisture
Mohs Hardness: 3

Thermal Expansion Coefficient aa =24.39 x 10-6/K; ac = 5.68 x 10-6/K Crystal Class negative uniaxial with no=na=nb, ne=nc

Transparency Curve of Calcite
Refractive Indices, Birefringence (Dn = ne - no) and Walk-off Angle at 45 (r):
no = 1.6557,  ne = 1.4852,  Dn = -0.1705,    r = 6.20 at 0.63 mm
no = 1.6629,  ne = 1.4885,     Dn = -0.1744,    r = 6.32  at 1.30 mm
Sellmeier Equation (l in mm):
no2 = 2.69705 + 0.0192064/(l2 - 0.01820) - 0.0151624l2
n e2 = 2.18438 + 0.0087309/(l2 - 0.01018) - 0.0024411l2

Surface Quality

20/10 Scratch and Dig

Dimension tolerance


Beam Deviation

<3 arc min.

Optical axis orientation


Flatness l/4@632.8nm
Transmission wavefront distortion l/2@632.8nm
AR-coating R<0.5%

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Calcite Crystal