In this study, we present the results of theoretical calculations related to heat transfer in materials subjected to laser radiation, with a focus on Z-scan experiments. Utilising a computational approach, we employ explicit difference methods to model the temperature distribution in three-dimensional hexahedral samples of varying sizes, including [4x4x2]mm, [5x5x2]mm, and [6x6x2]mm. The simulations incorporate the effects of three distinct types of pulse lasers, each with duration of 10 (ns), 100 (ps), and 100 (fs). Laser parameters are tailored such that they yield a peak on-axis irradiance of 5 (GW/cm2).
The temperature distribution within the samples, denoted as T(x, y, z, t), is calculated using our novel laser heat source model, specifically designed for the simulated problem. This research is facilitated by our computational program, Z-lambda, which enables the simulation of thermal processes not only during but also after Z-scan experiments. The computed results reveal that analysing thermal aspects in Z-scan experiments necessitates considering factors such as laser pulse duration, sample geometry, laser repetition time, sample heating, and the experimental environment.
Our findings provide valuable insights into the intricacies of heat transfer during and after Z-scan experiments, shedding light on the interplay between laser parameters, sample properties, and thermal responses. This work enhances our understanding of thermal processes in the context of laser-induced heating, offering significant implications for the design and interpretation of Z-scan experiments.