Nonlinear bubble nucleation and growth following filament and white-light continuum generation induced by a single-shot femtosecond laser pulse into dielectrics based on consideration of the time scale
Nonlinear bubble nucleation and growth following filament and white-light continuum generation induced by a single-shot femtosecond laser pulse into dielectrics based on consideration of the time scale
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DOI：
10.1063/1.4931362
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发表时间：
2015-09
影响因子：
4
通讯作者：
Y. Mizushima;T. Saito
中科院分区：
文献类型：
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作者：
Y. Mizushima;T. Saito
实验研究了单次飞秒脉冲辐照下液体中等离子体沟道（丝状体）和白光连续区中气泡的成核和生长，并对时间尺度进行了细致的观察。充分利用新的共焦系统和时间分辨可视化技术，我们获得了证据，表明在fs脉冲诱导的气泡的源头（10 - 13 s）和生长（10 - 7 s）期间，非线性/热效应的主要/次要作用，这在使用ns脉冲时从未观察到（即，视空化）。在这种情况下，fs脉冲引起的气泡不是普通的光学空化，而是非线性光学空化。我们提出的内在差异，在占主导地位的时域的fs-脉冲和ns-脉冲的激发，有趣的是，仅仅一百飞秒的激发预先确定的大小出现几微秒照射后的气泡。也就是说，成核在时间上发生超过六个数量级的差异。
Bubble nucleation and growth following plasma channeling (filament) and white-light continuum in liquid irradiated by a single-shot fs-pulse were experimentally investigated with close observation of the time scale. Making full use of a new confocal system and time-resolved visualization techniques, we obtained evidence suggestive of a major/minor role of the non-linear/thermal effects during the fs-pulse-induced bubble's fountainhead (10−13 s) and growth (10−7 s), which was never observed with the use of the ns-pulse (i.e., optic cavitation). In this context, the fs-pulse-induced bubble is not an ordinary optic cavitation but rather is nonlinear-optic cavitation. We present the intrinsic differences in the dominant-time domain of the fs-pulse and ns-pulse excitation, and intriguingly, a mere hundred femtoseconds' excitation predetermines the size of the bubble appearing several microseconds after irradiation. That is, the nucleation happens temporally beyond a six-order-of-magnitude difference.