|Title||Probing the effective length of plasma inside a filament.|
|Publication Type||Journal Article|
|Year of Publication||2017|
|Authors||Liu, 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|
|Date Published||2017 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 Journal||Opt Express|