Abstract
Quantitative measurement of electron number density in laser-induced plasma filament at atmospheric pressure was made using Rayleigh microwave scattering (RMS)1, 2. Plasma filament was produced by focusing 800 nm Ti:Sapphire laser pulses of hundred femtoseconds duration. Electron number densities down to about $10 ^{13}- 10 ^{14}$ cm $^{-3}$ were successfully ascertained using RMS technique. This is about three orders of magnitude below the minimal plasma density measurable by laser interferometry. Traditional laser interferometry for diagnostics of such rarified plasmas is arduous due to very small shifts of the interference fringes. Size of the microplasma filament was determined via imaging through an ICCD camera. The measured electron number density was the average density in the plasma volume and its variation temporally resolved to nanosecond scale. Capability to measure plasma density in rarified plasma filaments paves new ways for their utilization in diagnostic purposes.
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