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TitleProbing the effective length of plasma inside a filament.
Publication TypeJournal Article
Year of Publication2017
AuthorsLiu, Yaoxiang, Tiejun Wang, Na Chen, Shengzhe Du, Jingjing Ju, Haiyi Sun, Cheng Wang, Jiansheng Liu, Haihe Lu, See Leang Chin, Ruxin Li, Zhizhan Xu, and Zhanshan Wang
JournalOpt Express
Date Published2017 May 15

We present a novel method based on plasma-guided corona discharges to probe the plasma density longitudinal distribution, which is particularly good for the weakly ionized plasmas (~10cm). With this method, plasma density longitudinal distribution inside both a weakly ionized plasma and a filament were characterized. When a high voltage electric field was applied onto a plasma channel, the original ionization created by a laser pulse would be enhanced and streamer coronas formed along the channel. By measuring the fluorescence of enhanced ionization, in particular, on both ends of a filament, the weak otherwise invisible plasma regions created by the laser pulse were identified. The observed plasma guided coronas were qualitatively understood by solving a 3D Maxwell equation through finite element analysis. The technique paves a new way to probe low density plasma and to precisely measure the effective length of plasma inside a filament.

Alternate JournalOpt Express
PubMed ID28788791