Whole life-cycle of superfilament in water from femtoseconds up to microseconds

F. Potemkin, E. Mareev, A. A. Podshivalov, V. Gordienko
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Abstract

A whole life-cycle of the superfilamentation in water in tight focusing geometry was investigated. In this regime a single continuous plasma channel is formed. To achieve this specific regime the principal requirement is the usage of tight focusing and supercritical power of laser radiation. They together clamp the energy in the ultra-thin (approximately several microns) channel with a uniform plasma density distribution in it. The superfilament becomes a center of cylindrical cavitation bubble area and shock wave formation. The length of the filament increases logarithmically with laser pulse energy. The linear absorption decreases the incoming energy delivered to the focal spot, which dramatically complicates the filament formation, especially in the case of loose focusing. Aberrations added to the optical scheme lead to multiple dotted plasma sources for shock wave formation, spaced along the axis of pulse propagation. Increasing the laser energy launches the filaments at each of the dot, whose overlapping leads to enhance the length of the whole filament.
超丝在水中的整个生命周期从飞秒到微秒
研究了紧聚焦几何结构下超丝在水中的全生命周期。在这种情况下,形成了一个单一的连续等离子体通道。为了达到这种特殊的状态,主要要求是使用紧密聚焦和激光辐射的超临界功率。它们一起将能量夹在超薄(大约几微米)的通道中,通道内的等离子体密度分布均匀。超丝成为圆柱形空化泡区和激波形成的中心。灯丝的长度随激光脉冲能量的增加呈对数增长。线性吸收降低了传递到焦斑的入射能量,这大大复杂化了灯丝的形成,特别是在松散聚焦的情况下。光学方案中增加的像差导致沿脉冲传播轴分布的多个点状等离子体源形成激波。增加激光能量在每个点上发射细丝,它们的重叠导致整个细丝的长度增加。
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