Abstract

<p>This work represents the first stress-optical study of strontium titanate (SrTiO<sub>3</sub>). The report includes a brief review of previous stress-optical work on crystals, a brief review of synthetic SrTiO<sub>3</sub>, 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 (<i>q</i><sub>2211</sub>-<i>q</i><sub>1111</sub>) and 2<i>q</i><sub>1212</sub> 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 <i>q</i><sub>1111</sub> and <i>q</i><sub>2211</sub>, 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 stressoptical relationship up to "moderate" pressures.</p><p>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.</p>

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