Fig. 1. Diagram of gaussian pulse light source (a) and interaction between laser pulse and materials (b) (color online)

Fig. 2. Temporal evolution of electron and lattice temperature of the front surface, middle part and back surface of ruthenium thin film (a), and the contour plots of lattice temperature (b) (color online)

Fig. 3. Evolution of electron pressure (a) and blast force (b) with time and space (color online)

Fig. 4. Temporal evolution of electron and lattice temperature (a) at the front surfaces of ruthenium thin film, and the maximum electron temperature and the temperature for the equilibrium (b) under different energy density (color online)

Fig. 5. Temporal evolution of electron and lattice temperature (a) at the front surfaces of ruthenium thin film, and the maximum electron temperature and the temperature for the equilibrium (b) under different pulse durations (color online)

Fig. 6. Temporal evolution of electron and lattice temperature (a) at the front surfaces of ruthenium thin film, and the maximum electron temperature and the temperature for the equilibrium (b) under different pulse durations (color online)

Fig. 7. Temporal evolution of electron and lattice temperature (a) at the front surface of ruthenium thin film, and the relationship between the time of electron-lattice equilibrium and its electron-phonon coupling coefficient under different electro-phonon coupling coefficient (b) (shaded area represents trend range) (color online)