In-situ experimental work on laser induced pressure waves in water is presented in this paper. A double frequency
Nd:YAG laser(532 nm, 4 ns pulse width) was irradiated on a chromium thin film on quartz substrate in contact with
water. A plane pressure wave with high temporal and spatial resolution was generated by the laser induced
thermoelastic stress around 8~12 mJ/cm2 below the regime of shock wave generation. The pressure wave was
observed to propagate at the speed of sound in water. The plane acoustic wave could be interacted and focused with
solid structures. FEM numerical simulations of the aforementioned phenomena are also carried out to solve the 2D
transient wave equation and compared with the experimental results.
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