Dkt. Chu et Jd. Bierlein, SURFACE-ACOUSTIC-WAVE AND BLEUSTEIN-GULYAEV WAVE GENERATION IN KTIOPO4 CRYSTALS, Applied physics letters, 63(15), 1993, pp. 2041-2043
Surface acoustic waves (SAW) are observed in a z-cut KTP plate. Measur
ed frequency response for x-propagation SAW waves indicates a SAW velo
city of about 3940 m/s which agrees with theoretical calculations. The
calculated electromechanical coupling coefficient (k(SAW)2) is about
1%. X-propagation Bleustein-Gulyaev waves (BG) have also been observed
in a y-cut KTP plate. Center frequency of a delay line with uniform i
nterdigitated transducers indicates that BG waves possess a velocity a
bout 4256 m/s which is also in good agreement with theory. Using known
bulk parameters, the calculated electromechanical coupling coefficien
t for this BG wave (k(BG)2) is almost-equal-to 4%.