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Thermal generation of sound; thermoacoustic source; far-field directivity pattern; directional acoustic sources

The paper presents an analysis of ultrasonic wave generation in water by intensity modulated elliptical Gaussian laser beams. It is found that generated acoustic radiation is highly directional both in polar and azimuthal directions. An increase in the assymmetry of the transverse intensity distribution from the Gaussian dependence enhances the source 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.

M S Sodha^{1 2} S Konar^{1 3} M P Verma¹ V Rai¹

1. School of Physics, Devi Ahilya Vishwavidyalaya, Khandwa Road, Indore - 452 001, India
2. Lucknow University, Lucknow - 226 007, India
3. School of Energy Studies, Devi Ahilya Vishwavidyalaya, Khandwa Road, Indore - 452 001, India

Published

February 1994

Manuscript received

24 May 1993

Manuscript revised

29 September 1993