Dynamical Visualization of Laser-Induced Shock Phenomena in Liquid

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We observed dynamics of laser ablation in liquids through two high-speed imaging techniques, highspeed pump-and-probe photography and high-speed laser stroboscopic videography, and briefly described both imaging techniques. The target materials are epoxy-resin blocks immersed in a liquid environment, and the images were taken through circular polariscope optics in a bright-field mode. We simultaneously observed both phenomena in gas or liquid phases as well as inside a solid and visually demonstrated the confi ning effects of liquid on laser-induced shock processes. We also described the effects of liquid-layer thickness on the laser-induced shock process and studied the dynamical behavior of laser-induced cavitation bubbles through high-speed videography. The dynamics of a cavitation bubble was recorded successfully with 4-μs time resolution and its growth and shrinkage were analyzed. Secondary shocks are generated when the fi rst bubble collapsed and the magnitude of the shock inside the solid was approximately one order smaller than that of the initial laser-induced shock.

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  • レーザー研究

    レーザー研究 42 (6), 448-, 2014

    一般社団法人 レーザー学会

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