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DataRay Inc. - ISO 11146-Compliant Laser Beam Profilers
Photonics Dictionary

negative crystal

A uniaxial, birefringent crystal such as calcite or ruby in which the velocity of the extraordinary ray surpasses that of the ordinary ray. This can also be defined as the index of refraction of the extraordinary axis, ne is less than the index of refraction of the ordinary axis, no , thus making the extraordinary axis the fast axis of these crystals.
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