Comparative study of time-resolved K-shell spectra from aluminum plasmas generated by ultrashort laser pulses at 395 and 790 nm

A comparative study of temporally and spectrally resolved K- shell emission from aluminum targets heated with 150 fs Ti:sapphire laser pulses at 790 and 395 nm is presented at an intensity of 5x1017 W/cm2. Whereas at 395 nm spectrally broad intense plasma lines and a weak K α line with durations (full width at half maximum) of 1-2 ps are observed, the spectrum at 790 nm shows weak narrow plasma lines and an intense K α line with durations of 3-5 ps. (C) 2002 American Institute of Physics