Acousto-optic figure of merit of KREW crystals

The dataset includes calculated acousto-optic figure of merit M2 values for isotropic small-angle Bragg diffraction in monoclinic potassium rare-earth tungstate (KREW) crystals: KGW (potassium gadolinium tungstate, KGd(WO4)2), KYW (potassium yttrium tungstate, KY(WO4)2), and KLW (potassium lutetium tungstate, KLu(WO4)2). Each data file "KXW_AB.dat" and figure file "KXW_M2_AB.fig" corresponds to A-th acosutic mode index (1,2, or 3) and B-th optical mode index (1 or 2) of the crystal. Calculated M2 values are the maxima over all possible optical wave vector directions orthogonal to the given acoustic wave vector. Data table rows inlude Euler angles for the acosutic wave vector phi (column 1) and theta (column 2) expressed in degrees, figure of merit M2 (column 3) expressed in 1e-15 s^3/g, refractive index (column 4), and the rotation angle defining optical wave vector direction (column 5).