Temperature-dependent thermal lagging in ultrafast laser heating

• Published in: International journal of heat and mass transfer Vol. 44; no. 9; pp. 1725 - 1734
• Main Authors: Tzou, D.Y., Chiu, K.S.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.05.2001; Elsevier
• Subjects: Applied sciences; Condensed matter: structure, mechanical and thermal properties; Exact sciences and technology; Metals. Metallurgy; Physical properties of thin films, nonelectronic; Physics; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties); Thermal stability; thermal effects; Femtosecond; Temperature distribution; Gold; Laser-radiation heating; Theoretical study; Rapid process; Numerical method; Thin films; Thermal properties; Time resolution; Transition elements; Phase delay; Finite difference method
• ISSN: 0017-9310; 1879-2189
• DOI: 10.1016/S0017-9310(00)00215-5

Temperature-dependent phase-lags are incorporated in the dual-phase-lag (DPL) model to fully describe the experimental data of femtosecond (fs) laser heating on gold films of various thicknesses in the sub-micron range. An explicit finite difference algorithm is developed to perform the nonlinear analysis, which recovers the Crank–Nicholson stability criterion in the special case of Fourier diffusion. The exponents in the temperature-dependent thermal properties are determined by minimizing the mean error between the numerical and the experimental results. The lagging model with temperature-dependent thermal properties enables a consistent description of all the available experimental data for ultrafast laser heating on gold films.