Introducing a novel Green’s function-based method for laser and matter thermal interaction

Abstract

The thermal interaction of lasers with matter is studied in this work. Using the Green's function approach, equations governing this interaction are solved semi-analytically. Real conditions, such as the temperature dependence of thermal coefficients, and the surface radiation of matter, were taken into account when solving these equations. A computational code was written in the C programming language to simulate the problem. The proposed method decreases both calculation and simulation times considerably. The proposed method and the developed code are validated by experimental tests, and by means of comparison with another previously-published approach. Since a combination of numerical and analytical methods are used, the developed code is much faster than the numeric software. In addition, the proposed method is more accurate than analytical methods, due to the use of nonlinear boundary conditions. The thermal effects of a CW fiber laser on Al is also investigated. Results show that there is a threshold power density for achieving a melting point due to surface radiation. Higher power densities result in a shorter interaction time to achieve a melting point.

An integrated analytical model for the forecasting of the molten pool dimensions in Selective Laser Melting

“…In [31] the interaction of laser and matter is simulated by means of a semi-analytical model obtained combining a Green's function analytical method with a finite difference numerical method. In this study the temperature distribution in the matter was calculated.…”

Laser-induced voltage of shale due to photothermal effect

“…Previously, the anisotropic electrical response of a shale core has been monitored under the ultraviolet laser irradiation [14]. The destruction of drilling rock was also performed using a KrF laser beam [15][16][17][18]. It was concluded that the characteristic of shales can be represented with laserinduced voltage (LIV).…”