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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。
Aiming at the experiment of femtosecond laser-induced corona discharge, a new electrode optimization design is proposed. The difference between the spherical electrode and the traditional conical electrode in the femtosecond laser-induced corona discharge is theoretically analyzed. The spatial electric field distribution near the femtosecond fiber is given. The corona discharge near the tip of the femtosecond fiber is compared Of the halo field threshold. The experimental results of spherical electrodes and tapered electrodes in femtosecond laser-induced corona discharge were compared. Theoretical and experimental results show that the new design of the spherical electrode can significantly improve the coupling efficiency of the femtosecond filament with the applied electric field, and can improve the efficiency of femtosecond filament induced corona discharge.