An assessment of the acousto-optic figure of merit, M, was performed for th
e highly-polar non-centrosymmetric crystal, (-) 2-alpha-(methylbenzylamino)
-5-nitropyridine Its estimated value is as large as 1.3 x 10(-13) s(3) kg(-
1) at an ultrasound frequency of 15.4 MHz with light of wavelength 632.8 nm
. This value is about four times as large as that of the widely used inorga
nic crystal, PbMoO4.