Spatiotemporally resolved spectra of gaseous discharge between electrodes triggered by femtosecond laser filamentation

Atmospheric pressure discharge plasma is widely utilized in industry and science. However, due to the spatiotemporal uncertainty of the natural discharge, it is difficult to measure the discharge plasma spectra with a high spatiotemporal resolution. This prevents the accurate investigation of discharge plasma evolution and limits further applications. Here, we harnessed a femtosecond laser filament to trigger and guide a high-voltage discharge, i.e., the discharge plasma channel is rigorously controlled by the filament in both space and time. Therefore, the spectra of the plasma channel with a high spatiotemporal resolution could be measured using an imaging spectrometer. The spectra of the whole process of femtosecond laser filament-triggered discharge plasma are thoroughly studied. According to the spectral emission features, the whole process is divided into three stages: femtosecond laser filamentation, streamer propagation, and discharge. The spectral emissions at different stages can be utilized as required according to the spectral emission features. Based on the spatiotemporally resolved spectra of the streamer, the streamer propagation velocity is calculated to be about 3 × 105 m/s. In addition, atomic emissions from a discharge plasma triggered by femtosecond laser filament can be used for one-dimensional component measurements of flow fields.

Zhu, ZhifengTianjin University (författare)
Li, BoTianjin University(Swepub:lu)forb-bli (författare)
Han, LeiTianjin University (författare)
Li, ZhongshanLund University,Lunds universitet,NanoLund: Centre for Nanoscience,Annan verksamhet, LTH,Lunds Tekniska Högskola,Förbränningsfysik,Fysiska institutionen,Institutioner vid LTH,LTH profilområde: Nanovetenskap och halvledarteknologi,LTH profilområden,LTH profilområde: Avancerade ljuskällor,Other operations, LTH,Faculty of Engineering, LTH,Combustion Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH,LTH Profile Area: Nanoscience and Semiconductor Technology,LTH Profile areas,Faculty of Engineering, LTH,LTH Profile Area: Photon Science and Technology,Faculty of Engineering, LTH,Tianjin University(Swepub:lu)forb-zli (författare)
Tianjin UniversityNanoLund: Centre for Nanoscience (creator_code:org_t)

Ingår i:Applied Physics B: Lasers and Optics: Springer Science and Business Media LLC128:100946-2171
Ingår i:Applied Physics B: Springer Science and Business Media LLC128:101432-0649

Av författaren/redakt...: Gao, Qiang; Zhu, Zhifeng; Li, Bo; Han, Lei; Li, Zhongshan

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