Comparative study of femtosecond and nanosecond laser-induced breakdown spectroscopy of depleted uranium.
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.
Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131, USA. lemming@unm.edu
Luke A
LA
Emmert
Rosemarie C
RC
Chinni
David A
DA
Cremers
C Randy
CR
Jones
Wolfgang
W
Rudolph