Optical interference and x-ray analysis methods are used to determine the mechanical stresses in single crystals of germanium and paratellurite, which cause local distortions of the wavefronts due to the photoelastic effect. The dislocation structure of the crystals close to optical anomalies is studied. The effect of high-temperature annealing on stress relaxation in germanium and paratellurite is investigated. © 2005 Optical Society of America
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