Acoustic light diffraction, associated with the modulation of the polarization of the light, in an easy-plane antiferromagnet

The intensity of acoustic light diffraction by an easy-plane antiferromagnet in the Raman-Nath regime, due to a photoelastic interaction of antiferromagnetic origin, is calculated in the case when there is no modulation of the refractive index to first order in the acoustic deformations, and the entire effect is due to the linear modulation of the light polarization. Quantitative estimates are made for FeBO₃. Pis’ma Zh. éksp. Teor. Fiz. 65, No. 4, 317–321 (25 February 1997)