Abstract
Femtosecond pulse laser (fs pulse) is high intensity and ultra-short pulse laser. It easily induces nonlinear optical phenomena for various materials. In this study, we carried out the time-resolved measurement in order to investigate the process of bubble nucleation induced by femtosecond laser irradiated into pure water in detail. In the time-resolved measurement, the pump-probe method and high-speed video camera was applied. From the results of time-resolved measurements, in about 800 ps, intensive lights were emitted from the central portion of the region in which the refractive index of the water was changed by the fs pulses. Subsequently, bubbles were generated at about 1 ns after the fs pulses irradiation into the water.
