Hk. Park et al., PRESSURE GENERATION AND MEASUREMENT IN THE RAPID VAPORIZATION OF WATER ON A PULSED-LASER-HEATED SURFACE, Journal of applied physics, 80(7), 1996, pp. 4072-4081
The transient pressure generated by the interaction of short-pulsed la
ser light with the liquid-solid interface is studied quantitatively. A
KrF excimer laser beam of tens of nanoseconds pulse duration irradiat
es water on a solid surface and induces rapid thermal expansion and ex
plosive vaporization. The pressure pulses launched into water by such
processes are detected experimentally by the photoacoustic probe beam
deflection method and a broadband piezoelectric transducer. The peak i
ntensities of the traveling pressure wave measured by these two method
s are compared with the theoretical thermoelastic predictions, The mea
surements show that a compressional pressure wave packet is radiated i
i om the water solid interface with the peak intensity of the order of
1 MPa at laser fluences up to about 100 mJ/cm(2). Simultaneous monito
ring of the bubble growth kinetics by the optical specular reflectance
probe has been performed, It is observed that the pressure generation
is enhanced by the bubble expansion in the superheated water for lase
r fluences exceeding the bubble nucleation thresholds. (C) 1996 Americ
an Institute of Physics.