Uncertainty Analysis of Melting and Resolidification of Gold Film Irradiated by Nano- to Femtosecond Lasers Using Stochastic Method

摘要

A sample-based stochastic model is presented to investigate the effects ofuncertainties of various input parameters, including laser fluence, laser pulseduration, thermal conductivity constants for electron, and electron-latticecoupling factor, on solid-liquid phase change of gold film under nano- tofemtosecond laser irradiation. Rapid melting and resolidification of a freestanding gold film subject to nano- to femtosecond laser are simulated using atwo-temperature model incorporated with the interfacial tracking method. Theinterfacial velocity and temperature are obtained by solving the energyequation in terms of volumetric enthalpy for control volume. The convergence ofvariance (COV) is used to characterize the variability of the input parameters,and the interquartile range (IQR) is used to calculate the uncertainty of theoutput parameters. The IQR analysis shows that the laser fluence and theelectron-lattice coupling factor have the strongest influences on theinterfacial location, velocity, and temperatures.