水中飞秒灯丝激发的多气泡动力学：畸变的作用
Dynamics of multiple bubbles, excited by femtosecond filament in water: Role of aberrations
摘要：
利用阴影照相技术，在超临界功率（~100 Pcr）条件下，观察了紧聚焦飞秒激光脉冲在水中激发的多个空化泡的微秒级时间尺度演化。在这些极端条件下，高能量传递到微体积的液体样品中导致产生单丝，这成为空化区域形成的来源。当像差被添加到光学方案时，沿着灯丝轴形成热点。在高能量（超过40 uJ）下，这些热点中的细丝被点燃，结果，产生了复杂的空化气泡图案。空泡可以相互隔离，也可以形成奇特的水滴状空泡区，在其寿命结束时的演化过程中，在最后的崩溃之前，包含了射流排放。从脉冲能量和聚焦角度研究了空化斑图的动力学特性。我们发现，更大的数值孔径的聚焦光学导致更大的空化区长度。气泡间存在强相互作用。这导致气泡的演化发生了显著的变化，这与Rayleigh模型尚不相符。
英文摘要：
Using shadow photography, we observed microsecond time scale evolution of multiple cavitation bubbles, excited by tighty focused femtosecond laser pulse in water under supercritical power regime (~100 Pcr). In these extreme conditions high energy delivery into the microvolume of liquid sample leads to creation of single filament which becomes a source of cavitation region formation. When aberrations were added to the optical scheme the hot spots along the filament axis are formed. At high energies (more than 40uJ) filaments in these hot spots are fired and, as a result, complex pattern of cavitation bubbles is created. The bubbles can be isolated from each other or build exotic drop-shaped cavitation region, which evolution at the end of its life, before the final collapse, contains the jet emission. The dynamics of the cavitation pattern was investigated from pulse energy and focusing. We found that greater numerical aperture of the focusing optics leads to greater cavitation area length. The strong interaction between bubbles was also observed. This leads to a significant change of bubble evolution, which is not yet in accordance with Rayleigh model.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
