Pump propagation in short-pulse-driven recombination x-ray lasers

Abstract

The propagation of the optical laser (pump) used in optical-field ionized recombination x-ray lasing schemes [D. C. Eder et. al, Phys. of Plasmas 5, 1744 (1994)] is examined. A model which self consistently evolves the laser radiation as it ionizes a neutral gas is presented. The model allows for multiple ionization stages and for spatial variations in the neutral gas density appropriate for studying propagation through gas jets and laser evaporated gases. Typical experimental conditions are examined and it is found that ionization induced refraction plays a dominant role in the evolution of the laser pulse.