On. Galkin et al., LIGHT-DIFFRACTION FROM MULTIFREQUENCY VOLUME GRATINGS IN ANISOTROPIC MEDIA, International journal of nonlinear optical physics, 3(1), 1994, pp. 55-68
New principles of light anisotropic diffraction from complex (multifre
quency) gratings have been studied theoretically and experimentally in
case of two sound waves excited in the same volume. It has been shown
that two different types of the intercombined multiphonon processes e
xist. Namely this peculiarity ensures reciprocity of the light transmi
ssion in opposite directions. Simultaneously qualitatively new (two-st
ep) dependences of the diffracted electromagnetic wave intensity on so
und frequency have been discovered.