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VOLUME 51 (1990) | ISSUE 11 | PAGE 586
Generation of intense ultrasonic pulses by planar or concave focusing surface exploded by a current or by a laser beam
The generation and focusing of an intense ultrasonic shock pulse during the electrical or laser-induced explosion of curved surfaces (a metal-coated polyester film, a layer of an absorbing dye, etc.) are described. A pulse with an amplitude of thousands of atmospheres has been produced experimentally in a small spot 6.5 cm away from the emitting surface. Estimates of the nonlinear acoustic self-refraction show that the pressures are close to the limit but might be increased by increasing the focusing angle. Applications of this source of sound are suggested: in research on the nonlinear properties of media, on nonlinear acoustic processes, on the Cerenkov emission of sound from sound, on remote destruction of media, etc.