Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 17, Pages 3831-3834Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.3831
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High-harmonic generation and high-order above-threshold ionization spectra calculated in the strong-field approximation are analyzed in terms of the complex space-time orbits that result from a saddle point analysis of the underlying integrals. For elliptical polarization, the plateaus of the spectra of high-harmonic generation and high-order above-threshold ionization each turn into a staircase of very similar appearance. Each step of the stair can be traced to a particular pair of orbits which are almost identical in both cases.
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