Harmonic generation spectroscopy with a two-colour laser field having orthogonal linear polarizations

Authors

T. S. Sarantseva, Voronezh State UniversityFollow
M. V. Frolov, Voronezh State University, RussiaFollow
N. L. Manakov, Voronezh State UniversityFollow
M. Yu. Ivanov, Voronezh State University
Anthony F. Starace, University of Nebraska-LincolnFollow

Document Type

Article

Date of this Version

11-2013

Citation

J. Phys. B: At. Mol. Opt. Phys. 46 (2013) 231001 (7pp)
doi:10.1088/0953-4075/46/23/23

Comments

Copyright 2013 IOP Publishing Ltd. Used by permission.

Abstract

The interpretation of many high-order harmonic generation (HHG) experiments is based on the assumption that the HHG yield of an atom can be factorized into (i) a laser-dependent ‘electron wave packet’ with rather simple properties, including a nearly universal shape, and (ii) an atomic photorecombination cross section. We show that this factorization is restricted to linearly polarized laser fields and fails in two-colour laser fields with orthogonal polarizations. At the same time, we show how two-colour HHG spectroscopy using orthogonally polarized intense fundamental and relatively weak second harmonic fields makes a complete experiment possible that enables the retrieval of the angle-resolved photorecombination cross sections for atomic p states.