Optical Birefringence in Alkali Halides

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Abstract
Experiments on a number of alkali halide single crystals of high purity and optical quality have shown evidence of small birefringence properties. These crystals have been found to have a small paramagnetic uniaxial anisotropy when studied with a delicate torsion pendulum technique and the magnetic centers were assigned to dislocations oriented in great number along the 〈100〉 direction. The present optical study suggests that the optical-anisotropy-producing defects also may be aligned with the 〈100〉 direction.

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