Abstract
A helium (He) atmospheric pressure plasma jet (APPJ) system was constructed, and two guided streamers in He APPJ were produced. The propagation of the guided streamer was observed using ICCD camera when a grounded metallic target was employed. The target extended the lifetime of the plasma radiation of the guided streamer. A ns pulsed laser was irradiated at He APPJ with the target and optical emission spectra were measured. The interaction between the APPJ and pulsed laser enhanced various spectra of He APPJ. The enhancement of the spectra, the line integrated population density of He 23S metastable state, electron temperature, and electron density were measured as the time interval between the pulsed laser and the guided streamer changed. The relative spatial distribution of He 23S metastable state in the guided streamer in the absence of the pulsed laser was deduced along He flow. The role of He metastable state was discussed when the pulsed laser interacted with He APPJ.
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