dorsal/arxiv
View SchemaHigh-order harmonic generation with a strong laser field and an attosecond-pulse train: the Dirac Delta comb and monochromatic limits
| Authors | C. Figueira de Morisson Faria, P. Salieres |
|---|---|
| Categories | |
| ArXiv ID | physics/0610254 |
| URL | https://arxiv.org/abs/physics/0610254 |
| DOI | 10.1134/S1054660X07040147 |
Abstract
In recent publications, it has been shown that high-order harmonic generation can be manipulated by employing a time-delayed attosecond pulse train superposed to a strong, near-infrared laser field. It is an open question, however, which is the most adequate way to approximate the attosecond pulse train in a semi-analytic framework. Employing the Strong-Field Approximation and saddle-point methods, we make a detailed assessment of the spectra obtained by modeling the attosecond pulse train by either a monochromatic wave or a Dirac-Delta comb. These are the two extreme limits of a real train, which is composed by a finite set of harmonics. Specifically, in the monochromatic limit, we find the downhill and uphill sets of orbits reported in the literature, and analyze their influence on the high-harmonic spectra. We show that, in principle, the downhill trajectories lead to stronger harmonics, and pronounced enhancements in the low-plateau region. These features are analyzed in terms of quantum interference effects between pairs of quantum orbits, and compared to those obtained in the Dirac-Delta limit.
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"abstract": "In recent publications, it has been shown that high-order harmonic generation\ncan be manipulated by employing a time-delayed attosecond pulse train\nsuperposed to a strong, near-infrared laser field. It is an open question,\nhowever, which is the most adequate way to approximate the attosecond pulse\ntrain in a semi-analytic framework. Employing the Strong-Field Approximation\nand saddle-point methods, we make a detailed assessment of the spectra obtained\nby modeling the attosecond pulse train by either a monochromatic wave or a\nDirac-Delta comb. These are the two extreme limits of a real train, which is\ncomposed by a finite set of harmonics. Specifically, in the monochromatic\nlimit, we find the downhill and uphill sets of orbits reported in the\nliterature, and analyze their influence on the high-harmonic spectra. We show\nthat, in principle, the downhill trajectories lead to stronger harmonics, and\npronounced enhancements in the low-plateau region. These features are analyzed\nin terms of quantum interference effects between pairs of quantum orbits, and\ncompared to those obtained in the Dirac-Delta limit.",
"arxiv_id": "physics/0610254",
"authors": [
"C. Figueira de Morisson Faria",
"P. Salieres"
],
"categories": [
"physics.atom-ph"
],
"doi": "10.1134/S1054660X07040147",
"title": "High-order harmonic generation with a strong laser field and an attosecond-pulse train: the Dirac Delta comb and monochromatic limits",
"url": "https://arxiv.org/abs/physics/0610254"
},
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