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Photonics Dictionary

optically uniaxial crystal

A transparent crystalline substance in which the refractive index of the optic axis (extraordinary axis) is different from the other two crystal axes. Two polarization directions are allowed for any given propagation direction with respect to the optic axis of the crystal. The ordinary polarization direction is perpendicular to the optic axis. The extraordinary ray is parallel to the plane formed by the optic axis and the propagation direction and is perpendicular to the polarization direction of the ordinary ray. All polarizations are ordinary (i.e., do not change with propagation direction) for rays propagating parallel to the optic axis. The refractive indices for the ordinary and extraordinary waves are different for a uniaxial crystal and thus ne ≠ no
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