Data on acoustic (absorption and velocity of sound), optical (refractive in
dex and optical absorption coefficient), and photoelastic (coefficients of
acoustooptical quality and photoelastic constants) properties of KY(MoO4)(2
) crystals are obtained. It is shown that, not only does the anisotropy of
binding forces lead to a significant anisotropy of acoustic and photoelasti
c properties, but it also determines anomalously high elastic nonlinearity
in the direction of the Y-axis perpendicular to cleavage planes. (C) 2000 M
AIK "Nauka/Interperiodica".