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Near threshold nucleation and growth of cavitation bubbles generated with a picosecond laser
Ultrasonics Sonochemistry ( IF 8.4 ) Pub Date : 2022-11-28 , DOI: 10.1016/j.ultsonch.2022.106243
Vid Agrež 1 , Jaka Mur 1 , Jaka Petelin 1 , Rok Petkovšek 1
Affiliation  

The nucleation and growth of cavitation bubbles few micrometers in size in water generated by a 60 ps 515 nm fiber laser is observed and visualized near nucleation threshold. The study is performed by monitoring the plasma size, the cavitation bubble size and the emitted shock waves. The latter two aspects are supported by the Gilmore model using a Noble-Abel-stiffened-gas (NASG) equations of state. For the first time, two types of cavitation events are identified and visualized that exhibit a difference of more than two orders of magnitude in the excitation energy converted to mechanical effects with minimal change in excitation laser pulse energy. The result is localized cavitation and reduced mechanical stress on water-based media with potentially positive implications for laser treatments of biological tissue.



中文翻译:

皮秒激光产生的空化气泡的近阈值成核和生长

在 60 ps 515 nm 光纤激光器产生的水中,几微米大小的空化气泡的成核和生长在成核阈值附近被观察和可视化。该研究是通过监测等离子体大小、空化气泡大小和发射的冲击波来进行的。使用 Noble-Abel-stiffened-gas (NASG) 状态方程的 Gilmore 模型支持后两个方面。首次识别和可视化了两种类型的空化事件,这两种类型的空化事件在转换为机械效应的激发能量中表现出超过两个数量级的差异,而激发激光脉冲能量的变化最小。结果是水基介质上的局部空化和机械应力降低,对生物组织的激光治疗具有潜在的积极影响。

更新日期:2022-11-29
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