Analysis On Non-Fourier Effect Of Thin Film Irradiated With Intense Laser

The laser technology has been widely used in fields of the high-tech industry and the military defense. The mechanism of laser-irradiated materials is the foundation of laser weapons and protective equipments research.On the basis of heat transfer theory, and according to the non-Fourier thermal conduction theory, the thermal response under the high energy laser irradiation has been studied. The main results obtained are as follows:(1) The analytic expressions of the material temperature field were deduced by the Laplace Transform method when thin film heated on single side and both sides by heat flow.(2) After studying the analytical expression of the temperature field, The results are as follows. When thin film irradiated, the temperature increases over time. Laser heat flux which changes by sine function causes the undulatory temperature field along with the time grows. The less the pulse width is, the less volatility of the temperature. When the pulse width increases, the volatility of the temperature will also increase, but it will not change final temperature. Relaxation time becoming larger makes the final temperature larger. When the change of relaxation time is large, the damping will become larger as the relaxation time decreases obviously. At the same time, the temperature volatiles along the film thickness direction, it may generate the heat-resonance phenomenon. In addition, the thickness of thin film will also have effect on the temperature. When the thickness increases, the temperature will reduce.