dorsal/arxiv
View SchemaHarmonic generation by atoms in circularly polarized two-color laser fields with coplanar polarizations and commensurate frequencies
| Authors | F. Ceccherini, D. Bauer, F. Cornolti |
|---|---|
| Categories | |
| ArXiv ID | physics/0211110 |
| URL | https://arxiv.org/abs/physics/0211110 |
| DOI | 10.1103/PhysRevA.68.053402 |
Abstract
The generation of harmonics by atoms or ions in a two-color, coplanar field configuration with commensurate frequencies is investigated through both, an analytical calculation based on the Lewenstein model and the numerical ab initio solution of the time-dependent Schroedinger equation of a two-dimensional model ion. Through the analytical model, selection rules for the harmonic orders in this field configuration, a generalized cut-off for the harmonic spectra, and an integral expression for the harmonic dipole strength is provided. The numerical results are employed to test the predictions of the analytical model. The scaling of the cut-off as a function of both, one of the laser intensities and frequency ratio $\eta$, as well as entire spectra for different $\eta$ and laser intensities are presented and analyzed. The theoretical cut-off is found to be an upper limit for the numerical results. Other discrepancies between analytical model and numerical results are clarified by taking into account the probabilities of the absorption processes involved.
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"abstract": "The generation of harmonics by atoms or ions in a two-color, coplanar field\nconfiguration with commensurate frequencies is investigated through both, an\nanalytical calculation based on the Lewenstein model and the numerical ab\ninitio solution of the time-dependent Schroedinger equation of a\ntwo-dimensional model ion. Through the analytical model, selection rules for\nthe harmonic orders in this field configuration, a generalized cut-off for the\nharmonic spectra, and an integral expression for the harmonic dipole strength\nis provided. The numerical results are employed to test the predictions of the\nanalytical model. The scaling of the cut-off as a function of both, one of the\nlaser intensities and frequency ratio $\\eta$, as well as entire spectra for\ndifferent $\\eta$ and laser intensities are presented and analyzed. The\ntheoretical cut-off is found to be an upper limit for the numerical results.\nOther discrepancies between analytical model and numerical results are\nclarified by taking into account the probabilities of the absorption processes\ninvolved.",
"arxiv_id": "physics/0211110",
"authors": [
"F. Ceccherini",
"D. Bauer",
"F. Cornolti"
],
"categories": [
"physics.atom-ph"
],
"doi": "10.1103/PhysRevA.68.053402",
"title": "Harmonic generation by atoms in circularly polarized two-color laser fields with coplanar polarizations and commensurate frequencies",
"url": "https://arxiv.org/abs/physics/0211110"
},
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