A model has been developed for the propagation of a femtosecond laser pulse through an ionizing medium, which predicts the spectral shift and broadening in the transmitted pulse, and the electron energy distribution within the plasma. For gaseous targets at laser intensities of 10 to the 15th010 to the 16th Wsq. cm., the calculated blue-shifts do not agree with predictions from a homogeneous Drude model. The importance of the electron energy distribution for cold-plasma production in solid-target experiments is discussed.
This article is from 'Osa Proceedings of the Topical Meeting (5th) on Short-Wave Length Coherent Radiation: Generation and Applications Held in Monterey, California on 8-10 April 1991. Volume 11,' AD-A252 973, p271-275.