Abstract
With ultrashort pulse laser systems a strongly nonequilibrium plasma can be created by optical field ionization (OFI) of a gaseous medium in an intense laser field Investigations of OFI plasmas are important for soft x-ray laser applications. We present results of time-resolved studies of Helium and Oxygen plasmas produced by focusing of 150 fs Ti:sapphire laser pulses into He and O2 gas jets. Linearly and circularly polarized laser pulses at 800 nm and at the second harmonic (400 nm) with energies of 100 mJ or 60 mJ are used.
© 1998 IEEE
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