GENERATION OF ULTRASONIC-WAVES IN WATER BY AN ELLIPTIC GAUSSIAN LASER-BEAM

The paper presents an analysis of ultrasonic wave generation in water by intensity modulated elliptical Gaussian laser beams. It is found th at generated acoustic radiation is highly directional both in polar an d azimuthal directions. An increase in the assymmetry of the transvers e intensity distribution from the Gaussian dependence enhances the sou rce directivity considerably. An obvious conclusion is that elliptical Gaussian beams are better choice in applications where it is desired to communicate in an approximately prescribed small solid angle.