Emmert Luke A, Chinni Rosemarie C, Cremers David A, Jones C Randy, Rudolph Wolfgang
Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131, USA.
Appl Opt. 2011 Jan 20;50(3):313-7. doi: 10.1364/AO.50.000313.
We present spectra of depleted uranium metal from laser plasmas generated by nanosecond Nd:YAG (1064 nm) and femtosecond Ti:sapphire (800 nm) laser pulses. The latter pulses produce short-lived and relatively cool plasmas in comparison to the longer pulses, and the spectra of neutral uranium atoms appear immediately after excitation. Evidence for nonequilibrium excitation with femtosecond pulses is found in the dependence of spectral line intensities on the pulse chirp.
