Theoretical analysis and simulation of pulsed laser heating at interface

Abstract

Quantitative yet simple analytical solutions of surface temperature under pulsed laser illumination are presented for a quick estimation in optical spectroscopy studies. Dependence of steady state surface temperature as well as its temporal evolution on laser parameters, such as repetition rate and beam radius, together with medium properties is thoroughly investigated using the analytical solution, which is supported by numerical simulation. It is found that when the pulse number is larger than 100 within the heat diffusion time, the steady-state temperature rise reaches more than 85% of the temperature rise induced by CW laser heating of the same power. We provide a summary of the results to allow their use for a quick estimate of surface temperature evolution from pulse laser heating if laser parameters and medium properties are known.