Dynamics of Strong-Field Laser-Induced Micro-Plasma Formation in Noble Gases
نویسندگان
چکیده
Dynamics of Strong-Field Laser-Induced Micro-Plasma Formation in Noble Gases D. A. Romanov, R. Compton, A. Filin, R. J. Levis 1. Center for Advanced Photonics Research, College of Science and Technology Temple University, Philadelphia, PA 19122 2. Department of Physics, Temple University, Philadelphia, PA 19122 3. Department of Chemistry, Temple University, Philadelphia, PA 19122 (Physical Review A: Accepted December 30, 2009) Abstract The ultrafast dynamics of micro-plasmas generated by a femtosecond laser pulses in noble gases has been investigated using four-wave mixing (FWM). The time dependence of the FWM signal is observed to reach higher intensity levels faster for Xe, with progressively lower scattering intensity and longer time dynamics for the noble gas series Xe, Kr, Ar, Ne and He. The temporal dynamics is interpreted in terms of a tunnel ionization and impact cooling mechanism. A formalism to interpret the observed phenomena is presented here with comparison to the measured laser intensity and gas pressure trends.
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