Birefringent Crystals

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CaCO3 - Calcite

CaCO3 - Calcite
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Dimension tolerance +0/-0.05
Parallelism <15 arc seconds
Perpendicularity <10 arc minutes
Flatness L/4 @ 632.8 nm
Surface Quality 20-10 S/D
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Due to structural anisotropy it has two refractive indices. So it divides an entering beam of monochromatic light into two beam having opposite polarization. This phenomenon is used to build polarization components. As the difference in the two refractive indices is very large calcite has become the most popular crystal in polarization applications.

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