Elastooptic and elastogyration light diffraction by the domain structure of Ba²NaNb⁵O¹⁵ crystals

Abstract

The experimental investigation of light diffraction on the ferroelastic domains in Ba₂NaNb₅O₁₅ crystals was performed. The dependence of elastogyration diffraction efficiency on the angle between incident optical beam and crystal surface was obtained and used for the photoelastic coefficient P₁₂₁₂ calculation. The possibility of existence of elastogyration light diffraction on domains possessing different optical activity was proved. The elastogyration light diffraction of the enantiomorphous domains in Ba₂NaNb₅O₁₅ was experimentally investigated. The elastogyration coefficient for this crystal was calculated using the obtained data.