Abstract
We examine two analytical models describing the photoionization of molecules in both tunnel and multiphoton regimes. Applying these models to the nonlinear propagation of chirped laser beams in the atmosphere, we demonstrate how chirp phases can be used as a tool to monitor the self-guiding range of femtosecond filaments or even to shorten the pulse duration. The good agreement between simulations and experimental measurements validates our numerical code for ultrashort-pulse propagation in air.
© 2006 Optical Society of America
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