Time duration of VUV-radiation emission of a laser produced plasma as function of laser pulse length and wavelength of observation

Abstract

The influence of the laser-pulse length of the vuv-radiation emission of a laserproduced plasma has been investigated between 30 and 80 nm. The plasma was produced by focussing the beam of a Nd: YAG/glass laser system (λ=1064 nm,E≈300 mJ) on an uranium target. The laser pulse duration was varied between 11 and 60 ns full width at half maximum (FWHM) while keeping the laser pulse energy constant. A wavelength dependent correlation between laser-pulse length and the time duration of the vuv-radiation emission of the plasma was observed. The time duration of the vuv-radiation emitted by the laserproduced plasma was in the same order (15–50 ns FWHM), as the laser pulse length. With increased wavelengths of observation or increased laser-pulse length longer vuv-radiation emission was found.