Theoretical study on line source laser-induced surface acoustic waves in two-layer structure in ablative regime |
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| Authors: | Z H Shen B Q Xu X W Ni J Lu S Y Zhang |
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| Institution: | a Department of Applied Physics, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China;b Faculty of Science, Jiangsu University, Zhenjiang, Nanjing 212013, People's Republic of China;c Institute of Modern Acoustics, Nanjing University, Nanjing 210093, People's Republic of China |
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| Abstract: | The generation of ultrasound in film–substrate system by a laser line source is studied in the case of ablation mechanism, which can be realized by adding a liquid layer at the excitation point. The time domain displacement can be yielded by the numerical jointed inversed Laplace–Fourier transformation technique. The typical surface acoustic waves (SAW) of two layer structures, slow film on fast substrate and fast film on slow substrate, are obtained and the effect of the propagation distance and the thickness of the film on the SAW are given. |
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| Keywords: | Laser SAW Two-layer structure |
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