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We experimentally examine a laser-induced underwater shock wave with aspecial attention to pressure impulse, the time integral of pressure evolution.%total pressure variation associated with the shock wave. Plasma formation,shock-wave expansion, and pressure in water are observed simultaneously using acombined measurement system that obtains high-resolution nanosecond-order imagesequences. These detailed measurements reveal a non-spherically-symmetricdistribution of pressure peak. In contrast, remarkably, pressure impulse isfound to distribute symmetrically for a wide range of experimental parameterseven when the shock waves are emitted from an elongated region. The structureis determined to be a collection of multiple spherical shock waves originatedfrom point-like plasmas in the elongated region.

On pressure impulse of a laser-induced underwater shock wave