Collapse and Rebound of a Laser-Induced Cavitation Bubble

Abstract

Single cavitation bubble luminescence (SCBL) induced by laser in contrast to single bubble sonoluminescence (SBSL) has no need in a sound field for a strong collapse and for light emission. The cavitation bubbles are produced by focused laser light and make the single strong collapse. As shown experimentally, the number of emitted photons from cavitation luminescence is much greater than it was observed in sonoluminescence due to the large bubble size during the final stage of collapse. To describe the process of laser--induced bubble collapse a mathematical model is proposed, which is based upon the spherically--symmetric motion. The basic results of the numerical solution are presented for the bubbles with initial radii of about 1~mm. According to the observed results the minimum bubble radius in collapse is about 15 microns, and the mass decreases up to 5 per cent of the initial value. The calculations show a good agreement with experimental measurements.