Guo Yuning, Yang Dexing, Chang Ying, Gao Wei
Opt Express. 2014 Jan 13;22(1):166-76. doi: 10.1364/OE.22.000166.
The effect of asymmetry caused by oblique line-shaped laser ablation on the generation of ultrasonic waves in metal, especially the effect of transverse component of the ablation force source on the ultrasonic waves is analyzed. Due to the oblique force source, the displacements of shear wave increase obviously by the enhanced shear force, the energy concentration area of longitudinal wave deflects to the small range centered on the incident direction while that of shear wave is approximately perpendicular to incident direction. In addition, surface wave enhances in the direction of transverse power flow. Furthermore, some ultrasonic characteristics under vortex laser ablation condition are inferred.
分析了斜线状激光烧蚀引起的不对称性对金属中超声波产生的影响，特别是烧蚀力源横向分量对超声波的影响。由于力源倾斜，剪切力增强使剪切波位移明显增加，纵波能量集中区域偏向以入射方向为中心的小范围，而剪切波能量集中区域近似垂直于入射方向。此外，表面波在横向功率流方向增强。此外，还推断了涡旋激光烧蚀条件下的一些超声特性。
