Electrical conductive properties of femtosecond laser filaments are of significant interest for applications such as remote arc suppression and discharge guiding. We transmitted electrical current through a DC-biased air plasma channel formed in the wake of an energetic femtosecond laser pulse and observed an increased rate of change of the charge transmitted through the ionized channel with laser energy when crossing from the single- to multi-filament regimes. This behavior is attributed to the confluent effects of greater electron density and an increased cross-sectional area of the multi-filament plasma structures. As the laser energy is increased, the formation of additional conductive channels in the multi-filamentation regime becomes a significant contributor to the rapid increase of conductivity. These observations suggest a potential path to attractive applications such as efficient energy transfer in air mediated by femtosecond laser-produced filaments.

中文翻译：

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多丝状态下近红外飞秒空气丝的​​电导

飞秒激光灯丝的导电性能对于诸如远程电弧抑制和放电引导等应用具有重大意义。我们通过高能飞秒激光脉冲后形成的直流偏置的空气等离子体通道传输电流，并观察到当从单丝到多丝穿过时，通过激光能量，通过电离通道传输的电荷的变化率增加。政权。该行为归因于更大的电子密度和多丝等离子体结构的增加的横截面积的汇合效应。随着激光能量的增加，在多纤丝状态下形成额外的导电通道成为电导率快速增加的重要因素。