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Calcite (CaCO3)

Calcite is a naturally occuring negative uniaxial crystal that exhibits high birefringence and a wide spectral transmission range. Although cutting and polishing calcite are challenging due to its softness, it is a widely used material for visible and near IR polarizers, such as Glan Taylor, Glan Thompson and Glan laser.

  Transparency Range (nm) 350~2300
  Crystal Symmetry Class Trigonal-Rhombohedral, D3d
  Crystal Class Negative Uniaxial
  Hygroscopic Susceptibility Low Susceptibility to Moisture
  Coefficient of Thermal Expansion (/°K)
||C: 5.68X10-6
C: 24.39X10-6
  Refractive Indices no=1.6557, ne=1.4853 at 630nm
no=1.6629, ne=1.4885 at 1300nm
  Sellmeier Equation (λ in um) no2=2.69705+0.0192064/(λ2-0.01820)+0.0151624·λ2
  Density (g/cm3) 2.71
  Mohs Hardness 3
  Table 1: Calcite Physical and Optical Properties

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