Abstract
In this paper, we focused on the influence of gas pressure on the dynamic characteristics of laser-induced plasma (LIP) in air. The energy-dependent transmittances of a 1064 nm laser to LIPs generated at the pressure of 0.2–5 atm were measured. Laser Rayleigh scattering and Thomson scattering methods were applied to investigate the evolution of laser-produced shock wave and radial distribution of electron number density (ne) and electron temperature (Te) of LIP in air. The fraction of the shock wave energy to the total laser energy absorbed is about 40%–52% and increases upon increasing pressure. The higher the gas pressure, the greater ne and Te within the central of LIP and a faster decaying rate of Te and ne. The electron number density decays exponentially with time, and the decay index is between −0.891 and −1.177. A torus structure in LIPs is generated during the later stage of plasma decay and significantly affects the distribution of Te, ne and the intensity of plasma emission.
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