| 固体中脉冲激光激发声表面波的理论研究 |
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| 引用本文： | 高会栋,沈中华,徐晓东,张淑仪.固体中脉冲激光激发声表面波的理论研究[J].应用声学,2002,21(5):19-24. |
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| 作者姓名： | 高会栋 沈中华 徐晓东 张淑仪 |
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| 作者单位： | 1. 南京大学声学研究所,近代声学国家重点实验室,南京,210093
2. 南京大学声学研究所,近代声学国家重点实验室,南京,210093;南京理工大学信息物理与工程系,南京,210094 |
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| 基金项目： | 国家自然科学基金资助项目（10174038） |
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| 摘 要： | 本文运用本征函数展开的方法对固体材料中脉冲激光激发的声表面波进行了理论研究，在考虑热弹激发的条件下，利用三维的轴对称模型，得到了脉冲激光光源的脉冲宽度以及聚焦半径对固体材料中声表面波信号的时域及频域的影响，对进行超短脉冲激光激发超声的研究具有指导意义。
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| 关 键 词： | 脉冲激光 声表面波 理论研究 激光超声 热弹效应 本征函数展开法 固体材料 |
Theoretical study of surface acoustic wave generated by pulsed laser in solids |
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| GAO Huidong,SHEN Zhonghu,XU Xiaodong and ZHANG Shuyi.Theoretical study of surface acoustic wave generated by pulsed laser in solids[J].Applied Acoustics,2002,21(5):19-24. |
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| Authors: | GAO Huidong SHEN Zhonghu XU Xiaodong and ZHANG Shuyi |
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| Institution: | Laboratory of Mordern Acoustics, Institute of Acoustics, Nanjing University, Nanjing210093;Department of Applied Physics, Nanjing University of Science and Technology, Nanjing210094;Laboratory of Mordern Acoustics, Institute of Acoustics, Nanjing University, Nanjing210093;Laboratory of Mordern Acoustics, Institute of Acoustics, Nanjing University, Nanjing210093 |
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| Abstract: | A theoretical study on surface acoustic waves (SAW) generated by a pulsed laser is presented, using the eigenfunction expansion method. Taking only the thermo-elastic excitation into the consideration, and with the three dimensional axis-symmetric model, we get the influence of the rising time and the beam radius of the pulsed laser on the frequency bandwidth of the SAW generated in a solid. The results show that the maximum of the displacement and the limitation of the frequency of the SAW are determined by the rising time and the beam radius of the pulsed laser, which are very important in ultra-short pulsed laser ultrasonics. |
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| Keywords: | Laser ultrasonics Thermo-elastic effect Eigenfunction expansion method |
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