1 April 1990 Interaction of super-intense light fields with atoms and surfaces
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Using amplified 100 fs, 616 nm pulses, we employed pump-probe spectroscopy to investigate strong field interactions with gases and metal surfaces. The ionization dynamics of a gas with a pump pulse foeused to 1016 W/cm2 were deduced from spectral shifts in a probe pulse. In addition to above threshold ionization, impact ionization and a nonlinear dependence of the collision frequency on pulse intensity are proposed as mechanisms for the spectral shifts. Also, the cooling time of a high-temperature solid density plasma was measured specifically, the nonequiibrium electron energy distribution excited by a resonantly absorbed pulse focused to 5 x 1012 W/cm2 on a metal surface was measured with a photoelectron time-offlight detector.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Michael C. Downer, William C. Banyai, W. M. Wood, D. C. Anacker, and James L. Erskine "Interaction of super-intense light fields with atoms and surfaces", Proc. SPIE 1209, Picosecond and Femtosecond Spectroscopy from Laboratory to Real World, (1 April 1990); doi: 10.1117/12.17902; https://doi.org/10.1117/12.17902

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