THE 2ND-HARMONIC COMPONENT IN THE BESSEL BEAM

The analysis is based on the Khokhlov-Zabolotskaya-Kuznetsov wave equa tion. Analytical and approximate solutions are derived for the second harmonic component in the Bessel nondiffracting beam. The theoretical results indicate that the second harmonic beam is nearly nondiffractin g in the radial direction and the pressure amplitude is proportional t o the square root of propagation distance in the quasilinear approxima tion, and that the beamwidth of the second harmonic is just 1/2 times that of the fundamental component in the Bessel field, not as 1/root 2 times in the fields radiated by other sources. (C) 1996 American Inst itute of Physics.