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| Numerical simulation of influence of pulse width on temperature field generated by femtosecond laser
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| Faculty of Science, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract In order to study the influence of laser pulse width on the electron and lattice temperature fields and their equilibrium time, based on the twotemperature coupling theory, and by taking account of the spatial and temporal shape of the laser pulse, the numerical simulation of the temperature field of the metal surface irradiated by femtosecond pulse laser of Gaussian distribution was performed by using FEM. The twotemperature equations were given and the numerical model was established. The temperature fields of electron and lattice in metal materials were obtained. The results show that pulse width of femtosecond laser affects not only electron and lattice temperature rising speed and temperature maximum in one point but also spatial distribution of temperature field. The electronlattice coupling plays a major role in the equilibrium time when the pulse width is much lower than picosecond regime, while the laser pulse width plays a major role in the equilibrium time when the pulse width is close to picosecond regime. This study establishes a theoretical basis for stress and ultrasound fields in metal generated by femtosecond laser.
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2011, Vol. 32 
