液体激光聚焦击穿声辐射特性研究

Characteristics of laser-induced acoustic wave at different laser focusing position

激光与水介质相互作用时,在不同激光聚焦位置情况下,光击穿辐射声信号具有较大的差异性。为研究激光聚焦位置对辐射声波的影响,构建了激光声测量系统,实验研究了激光聚焦位置对光击穿辐射声信号的影响。结果表明,激光声信号脉冲宽度主要与激光脉冲宽度相关,与激光聚焦位置无关;激光聚焦位置影响声信号的时域波形及信号强度;应避免激光在空气中聚焦击穿。该研究结果有助于激光声研究的深入开展。

Because of the interaction between the laser and water, the laser-induced signal is much different at different focusing position. In order to study the effect of focusing position on the acoustic wave, a setup was built to test the laser-induced acoustic wave. Experimental results show that the pulse width of the acoustic wave is related to that of laser pulse, and is independent of laser focusing position. The focusing position only affects the time-domain profile and intensity of the acoustic wave. Furthermore, laser-induced plasma in air should be avoided. The results are helpful for further study on laser-induced acoustic wave.