Laser ablation of transparent liquid films on opaque solid surface

An experimental study of the superheating of liquids on amorphous silicon (a-Si) thin film caused by a short ultraviolet excimer pulsed laser is presented to establish a primary understanding of the mechanism of the laser ablation of thin liquid films on opaque surfaces.;The transient temperature of the superheated liquid at the interface are monitored by a cw diode laser. To obtain the interface temperature, the nanosecond time-resolved transmission signal is calibrated through the application of the one dimensional diffusion model and the transfer matrix theory. The results are in reasonable agreement with the known data for superheated liquids in the literature as well as theoretical calculations.;The temperature dependence of the optical constants for a-Si has been studied and it is observed that the extinction coefficient of a-Si increases significantly with temperature. This renders the measurement of the transient temperature at the liquid-solid interface during the laser pulse possible.