ELASTOOPTIC CONSTANTS OF SRLAALO4 AND SRLAGAO4 SINGLE-CRYSTALS DETERMINED BY BRILLOUIN-SCATTERING

In this paper we report the elastooptic constants pij of strontium lan thanum aluminate, SrLaAlO4 and strontium lanthanum gallate SrLaGaO4 si ngle crystals, which were determined at room temperature using Brillou in scattering method. Tn order to investigate the elastooptic constant s of SrLaAlO4 and SrLaGaO4 single crystals, a substitution method prop osed by Cummins and Schoen, and developed by Nelson and Lax was used. The obtained results are also discussed in terms of the nature defects which might arise in these crystals during growth process.