针对飞秒激光诱导电晕放电实验, 提出了一种新的电极优化设计方案。理论分析了球形电极与传统锥形电极在飞秒激光诱导电晕放电中的不同, 给出了飞秒光丝附近的空间电场分布, 比较了两种情形下飞秒光丝尖端附近电晕放电的起晕电场阈值。对比了球形电极与锥形电极在飞秒激光诱导电晕放电中的实验现象。理论和实验结果表明, 新设计的球形电极可显著提高飞秒光丝与外加电场的耦合效率, 并可提高飞秒光丝诱导电晕放电的效率。

An optimization design scheme is proposed for the femtosecond laser induced corona discharge experiment. The differences between spherical electrode and traditional cone electrode are investigated by numerical analysis. The distribution of space electric field around femtosecond filament is demonstrated, and the thresholds of corona electric field around femtosecond laser filament tip under the two situations are compared. The experimental phenomena of corona discharge of the two electrodes induced by femtosecond laser are compared. The simulation and experiment results show that the new designed spherical electrode dramatically improves the coupling efficiency between the femtosecond laser filament and the external electric field and the efficiency of corona discharge induced by femtosecond laser.