Department of Energy Sciences, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8502, Japan.
Opt Lett. 2009 Oct 1;34(19):2964-6. doi: 10.1364/OL.34.002964.
Femtosecond laser pulses were used to make plasma filaments near an isolated positively or negatively highly biased electrode. The electrode was well positioned to sustain a high voltage up to U(max)=+/-400 kV to avoid the induced breakdown or a glow discharge; the shape of the electrode was chosen to reduce the corona effects at the maximal voltage. The filament's UV emission is shown to be very sensitive to the voltage applied: it increases nonlinearly with the electrode potential. Along with nanosecond filament-induced flashes at both polarities, long, about a half microsecond, corona flashes were observed at the negative polarity.
飞秒激光脉冲被用来在一个孤立的带正或负高偏置电压的电极附近产生等离子体细丝。该电极的位置很好，可以维持高达 U(max)=+/-400 kV 的高电压，以避免感应击穿或辉光放电；选择电极的形状是为了在最大电压下减少电晕效应。实验发现，细丝的紫外发射对所施加的电压非常敏感：它随电极电势呈非线性增加。除了在两个极性上产生纳秒丝状诱导闪光外，在负极性上还观察到了大约半微秒长的长电晕闪光。
