Abstract

A nanosecond pulse discharge circuit is developed and used to enhance the optical emission of laser plasma. An intense discharge spark was observed with a peak discharge current of $1.9\mathrm{kA}$ and a peak power of $6.5\mathrm{MW}$. The main electric energy deposition only lasted for $\sim 40\mathrm{ns}$. An intense optical emission was observed. The line intensity of plasma emission was greatly increased along with an improved signal-to-noise ratio, in comparison with that using a microsecond pulse discharge circuit. From the measured spectra, electron temperature and electron number density were estimated. The mechanism of the optical emission enhancement was briefly discussed.

© 2011 Optical Society of America

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