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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Acoustic characterization of microbubble dynamics in laser-induced optical breakdown
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Acoustic characterization of microbubble dynamics in laser-induced optical breakdown

机译：激光诱导的光学击穿中微气泡动力学的声学表征

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摘要

A real-time acoustic technique to characterize microbubbles produced by laser-induced optical breakdown (LIOB) in water was developed. Femtosecond laser pulses are focused just inside the surface of a small liquid tank. A tightly focused, high frequency, single-element ultrasonic transducer is positioned so its focus coincides axially and laterally with this laser focus. When optical breakdown occurs, a bubble forms and a pressure wave is emitted (i.e., acoustic emission). In addition to this acoustic signal, the microbubble is actively probed with pulse-echo measurements from the same transducer. After the bubble forms, received pulse-echo signals have an extra pulse, describing the bubble location and providing a measure of axial bubble size. Wavefield plots of successive recordings illustrate the generation, growth, and collapse of cavitation bubbles due to optical breakdown. These same plots also can be used to quantify LIOB thresholds.
机译：开发了一种实时声学技术来表征水中激光诱导的光击穿（LIOB）产生的微气泡。飞秒激光脉冲恰好聚焦在小型储液罐表面的内部。放置紧密聚焦的高频单元件超声换能器，使其聚焦在轴向和横向上与该激光聚焦重合。当发生光学击穿时，形成气泡并且发射压力波（即，声发射）。除此声信号外，还通过来自同一换能器的脉冲回波测量来主动探测微泡。气泡形成后，接收到的脉冲回波信号会产生一个额外的脉冲，描述气泡的位置并提供轴向气泡大小的度量。连续记录的波场图说明了由于光学击穿而导致的气蚀气泡的产生，生长和破裂。这些相同的图也可用于量化LIOB阈值。

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