Abstract
The authors analyse the distortion of the pump laser beam propagating through the electron plasma produced by non-resonant MPI ionization. For calculating the aberration eikonal they use the complex eikonal technique developed by Choudhary and Felson (1973, 1974). In particular, they show that this eikonal can be expressed as an integral of the refractive index profile. Successively, they use the eikonal for calculating the amplitudes of the different Gauss-Laguerre modes of the qth harmonic generated by the laser pump beam. Finally, they apply this formalism to the study of the seventh harmonic produced in the non-resonant 11-photon ionization of Xe by a Nd-YAG laser.
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