Spectral Blueshifts of Femtosecond Pulses in Atmospheric Density Kr and Xe Plasmas,
TEXAS UNIV AT AUSTIN DEPT OF PHYSICS
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Collisionless multiphoton ionization of atmospheric density gases with intense femtosecond pulses can produce a cold, dense plasma of highly stripped ions, thus providing a promising medium for XUV recombinant lasers. We have shown in several recent papers that rapid ionization and the subsequent development of of plasma temperature in atmospheric density plasmas cause macroscopic refractive index changes which in turn induce characteristic spectral shifts on the ionizing pulse, or a time delayed probing pulse. Theoretical analysis of detailed features of these shifts in the lighter rare gases helium,neon, argon has revealed several key aspects of femtosecond ionization.
- Nuclear Physics and Elementary Particle Physics