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Impact of a liquid‐jet produced by the collapse of laser‐induced bubbles against a solid boundary

The mechanical effect induced by the collapse of cavitation bubbles in the neighborhood of a solid boundary is investigated by focusing a Q‐switched laser pulse on a metal target in water. By means of a fiber‐coupling optical beam deflection technique, the displacement generated by liquid‐jet impact at the final stage of the bubble collapse is detected at the epicenter of the rear metal surface. Furthermore, combining a widely used laser‐ablation model with the detection principles of this detector, the transient impact‐force value loading on the target material can be easily estimated. Besides, according to experimental results and the modified Rayleigh theory, the maximum bubble radius and the liquid‐jet pressure are also obtained, which are in good agreement with the results of other studies. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1525–1528, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21706