Open AccessTime-resolved spectrum characteristics of instantaneous plasma generation and evolution processes in nanosecond laser-Cu-target
Author(s) -
Yuanxing Liu,
Shibing Liu,
Haiying Song,
He Run
Publication year - 2012
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.61.044204
Subject(s) - laser , plasma , nanosecond , materials science , copper , time evolution , ultrafast laser spectroscopy , phase (matter) , pulse (music) , absorption (acoustics) , optics , atomic physics , beam (structure) , physics , quantum mechanics , detector , metallurgy , composite material
The physical processes in the generation and the evolution of copper plasma induced by a high power nanosecond laser pulse are investigated with time-resolved spectrum. In the solid-gas-liquid phase transition, the intensity of reflected beam evolving with time markedly reveals the absorption of laser energy in the laser-copper interacting zone. So the phase transitions on the surface of copper target result in the fact that intensity of reflected beam evolving with time obviously presents a double-peak structure. Meanwhile, the appearance times of the plasma-gas-liquid phase transition on the target surface is advanced with the increase of peak-power of laser pulse. Therefore, these transient properties can be an efficient approach to diagnosing the phase transitions of copper target when the laser irradiates the target surface.