标题： 水中超短脉冲丝激发表面多气泡的动力学：像差的作用 显示英文标题

标题： Dynamics of multiple bubbles, excited by femtosecond filament in water: Role of aberrations

摘要： 使用阴影摄影，我们观察到了由在超临界功率条件下（约100 Pcr）聚焦的飞秒激光脉冲在水中激发的多个空化气泡的微秒时间尺度演化。 在这些极端条件下，高能量输送到液体样品的微体积中会导致单一丝状结构的形成，该结构成为空化区域形成的来源。 当像差被添加到光学方案中时，在丝状结构轴上会形成热点。 在高能量（超过40uJ）下，这些热点中的丝状结构被点燃，从而产生复杂的空化气泡图案。 这些气泡可以彼此隔离或形成奇特的滴状空化区域，其在生命结束前的演化阶段包含射流发射。 空化图案的动力学特性从脉冲能量和聚焦角度进行了研究。 我们发现，聚焦光学器件的数值孔径越大，空化区域长度越长。 也观察到了气泡之间的强相互作用。 这导致了气泡演化的显著变化，这与瑞利模型尚不一致。 显示英文摘要

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.