Abstract

This work represents the first stress-optical study of strontium titanate (SrTiO3). The report includes a brief review of previous stress-optical work on crystals, a brief review of synthetic SrTiO3, and a brief review of stress-optical theory. The remainder of the paper is divided into two parts: Part I describes the piezobirefringence experimental apparatus and experimental procedure, sources of error and corrections, the measured values of the piezobirefringence constants (q2211q1111) and 2q1212 for the spectral range 4200–7700 A in steps of 100 A, an investigation of the linearity of the stress-optical relationship up to “moderate” pressures, and an investigation of stress-optical hysteresis up to “moderate” pressures. Part II covers the following: the problem of measuring the absolute values of stress-optical constants q1111 and q2211, apparatus and procedure, sources of error, the measured values of the stress-optical constants at 5400 A, the theoretical change in index of refraction under an hydrostatic stress, and confirmation of the linearity of the stress-optical relationship up to “moderate” pressures.

Strontium titanate has been found to become an optically negative uniaxial crystal when stressed along a crystallographic axis and an optically negative biaxial crystal when under a crystallographic diagonal stress.

© 1957 Optical Society of America

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