We present spectra of depleted uranium metal from laser plasmas generated by nanosecond Nd:YAG ( $1064\mathrm{nm}$ ) and femtosecond Ti:sapphire ( $800\mathrm{nm}$ ) 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.

© 2011 Optical Society of America

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