强吸收固体中激光超声脉冲的特性研究  

Study on the characteristics of laser-ultrasound pulse in strongly absorbing solid

作　　者：耿森林[1] 尚志远[1] 郭敏[1] 田华[1] 

机构地区：[1]陕西师范大学应用声学研究所,陕西西安710062

出　　处：《云南大学学报（自然科学版）》2004年第3期233-237,共5页Journal of Yunnan University(Natural Sciences Edition)

基　　金：国家自然科学基金资助项目(19596034).

摘　　要：对梯形激光脉冲入射到半无限强吸收固体媒质中热弹激发的超声应力脉冲进行了研究.给出了媒质表面束缚和自由2种情况下的超声应力脉冲的表达式及其理论曲线,并给出了自由表面下的实验结果,都表明表面束缚时应力脉冲是单极性的,自由时是双极性的,应力脉冲增宽不大,其特性还受激光脉冲形状的影响.The thermoelastic generation stress pulse in a semi-infinite strongly absorbing solid when a pulse laser is incident on its surface is studied.The expressions and curves of the ultrasound stress pulse for both free and clamped surfaces are presented.It is shown, theoretically and experimentally,that the ultrasound pulse is monopolar when the sample surface is clamped,and is bipolar when the sample surface free;and the stress pulse almost has the same width as laser pulse.

关 键 词：强吸收固体 激光超声脉冲 热弹 应力脉冲 温度场 

分 类 号：O426[理学—声学] O347.42[理学—物理]