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Calcite Birefrigent Crystal
Calcite, or Iceland Spar is often mined naturally that has high birefringence, wide spectral transmission and availability in reasonably sized rhombs. Calcite is a negative uniaxial crystal and mostly used as visible and near IR polarizers.
Calcite Crystal Properties
Refractive Index : No= 1.6654 at 0.51 μm
Reflection Loss : 11.7% at 0.51 μm (2 surfaces)
Absorption Coefficient : n/a
Reststrahlen Peak : n/a
dn/dT : 3 (para) 13 (perp) x 10E-6/°C at 0.5 μm
dn/dμ = 0 : n/a
Density : 2.71 g/cm³
Melting Point : 825°C (Decomposes)
Thermal Conductivity : 5.526 (para) 4.646 (perp) W /m /K at 273K
Thermal Expansion : 25 (para) 5.8 (perp) x 10E-6 /°C at 273K
Hardness : Knoop 155, Moh 3
Specific Heat Capacity : 852 J /Kg /K
Dielectric Constant : 8 (para) 8.5 (perp) at 10kHz at 293K
Youngs Modulus (E) : 72.35 (perp) 88.19 (para) GPa
Shear Modulus (G) : 35 GPa
Bulk Modulus (K) : 129.53 GPa
Elastic Coefficients : C11=137; C12=45; C13=45; C14=(21); C33=79
Apparent Elastic Limit : 4.83 MPa (700 psi)
Poisson Ratio : n/a
Solubility : 0.0014g/100g water at 25°C
Molecular Weight : 100.09
Class/Structure : Trigonal (hex), R3c, (1011) cleavage
Refractive Index vs Wavelength
No=1.6521 Ne=1.4835 @0.71μm
| 300nm | 410nm | 510nm | 640nm | 800nm | 1040nm | 1500nm | 2100nm | |
| No | 1.7196 | 1.6801 | 1.6653 | 1.6550 | 1.6487 | 1.6428 | 1.6346 | 1.6220 |
| Ne | 1.5137 | 1.4954 | 1.4896 | 1.4849 | 1.4822 | 1.4799 | 1.4774 | 1.4749 |
Calcite Specifications
2) Length: 35mm max
3) Surface Quality: better than 20/10 scratch/dig
4) Beam Deviation: 3 arc min
5) Optical Axis Orientation: +/- 0.5°
6) Flatness: λ/8 @633nm
7) Transimission Wavfront Distortion: λ/4 @633nm
8) Coating: upon customer's specification
Notes:
Calcite crystal is difficult to be polished due to low hardness, low susceptibility
and easy to moisture. YVO4 or a-BBO crystal is an alternative where high
quality elment is request.
Calcite Crystal Order Information
OptoCity offer different Calcite products such as slab, wedge prisms, Calcite Glan-Thompson Polarizer, Calcite Glan-Laser Polarizer, Calcite Glan-Taylor Polarizer, Calcite Rochon Polarizer, Calcite Wollaston Polarizer etc. Please send us an email to request for quote.