Global maxima for the acousto-optic effect in SrB₄O₇ crystals

For the first time, the global maxima of the acousto-optic interaction are theoretically determined for biaxial SrB₄O₇ crystals by the extreme surfaces method. As it is shown, the highest value of the acousto-optic figure-of-merit M₂ is equal to 6.3×10^-16 s³/kg and achieved in the case of the isotropic diffraction of the electromagnetic wave propagating in the [010] direction on the fast quasi-transversal acoustic wave.