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为研究激光击穿大气等离子体通道的长度、寿命及导电特性,应用光束整形的方法将Nd∶YAG脉冲激光2.1 J的能量均匀分布到长度约为1 m的直线上,均匀击穿大气,形成等离子体通道。从空间和时间的角度,分别研究了该等离子体通道的长度、寿命,并使用电学探测手段研究通道的连续导电性。实验结果表明,纳秒激光大气等离子体通道连续导电的空间长度可达80 cm左右,存活寿命在500 ns以上,通道的电阻主要由耦合电阻构成。这些实验结果是飞秒激光大气等离子体通道研究的有益补充,并为大气等离子体通道的应用技术开发提供了实验依据。
In order to study the length, life and conduction characteristics of laser plasma tunneling plasma, the energy of Nd: YAG pulsed laser 2.1 J was uniformly distributed on the straight line with a length of about 1 m by beam shaping, Plasma channels. From the perspective of space and time, the length and life span of the plasma channel were studied separately, and the continuous conductivity of the channel was studied by electrical detection. The experimental results show that the length of continuous conduction of nanosecond laser plasma channel is about 80 cm and the life span is above 500 ns. The resistance of channel mainly consists of coupling resistance. These experimental results are useful complement to the study of the femtosecond laser atmospheric plasma channel and provide the experimental basis for the application of atmospheric plasma channel technology development.