Characterization of a UV–VUV light source based on a gas-target ns-laser-produced plasma

We report measurements of the temporal and spatial evolution of plasmas, produced on gaseous targets by focused ns-Nd:YAG laser. Characterization of the UV–VUV light source includes time-resolved visualization of the spatial growth and the spectroscopic signatures of plasmas produced on pulsed, supersonic jets of helium, argon, nitrogen and xenon gases into a vacuum chamber. Photon fluxes of up to 1012 photons cm−2 nm−1/pulse have been measured in the wavelength region 100–260 nm within the first 30 ns following the laser pulse. Also discussed for comparison are plasma signatures in helium, argon and nitrogen gases at standard temperature and pressure. The results indicate availability of photon fluxes, at typical laser repetition rates, that are at least one order of magnitude higher than those achieved from commercial c.w. lamp light sources.