SURFACE-ACOUSTIC-WAVE AND BLEUSTEIN-GULYAEV WAVE GENERATION IN KTIOPO4 CRYSTALS

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%.