dorsal/arxiv
View SchemaStudy of the spatial and temporal coherence of high order harmonics
| Authors | Pascal Salières, Anne L'Huillier, Philippe Antoine, Maciej Lewenstein |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/9710060 |
| URL | https://arxiv.org/abs/quant-ph/9710060 |
Abstract
We apply the theory of high-order harmonic generation by low-frequency laser fields in the strong field approximation to the study of the spatial and temporal coherence properties of the harmonics. We discuss the role of dynamically induced phases of the atomic polarization in determining the optimal phase matching conditions and angular distributions of harmonics. We demonstrate that the phase matching and the spatial coherence can be controlled by changing the focusing parameters of the fundamental laser beam. Then we present a detailed study of the temporal and spectral properties of harmonics. We discuss how the focusing conditions influence the individual harmonic spectra and time profiles, and how the intensity dependence of the dynamically induced phase leads to a chirp of the harmonic frequency. This phase modulation can be used to control the temporal and spectral properties of the harmonic radiation. Temporally, the harmonic chirped pulse can be recompressed to very small durations. Spectrally, chirping of the fundamental beam may be employed to compensate for the dynamically induced chirp and to control the individual harmonic spectrum. Finally, we discuss the short pulse effects, in particular nonadiabatic phenomena and the possibility of generating attosecond pulses.
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"abstract": "We apply the theory of high-order harmonic generation by low-frequency laser\nfields in the strong field approximation to the study of the spatial and\ntemporal coherence properties of the harmonics. We discuss the role of\ndynamically induced phases of the atomic polarization in determining the\noptimal phase matching conditions and angular distributions of harmonics. We\ndemonstrate that the phase matching and the spatial coherence can be controlled\nby changing the focusing parameters of the fundamental laser beam. Then we\npresent a detailed study of the temporal and spectral properties of harmonics.\nWe discuss how the focusing conditions influence the individual harmonic\nspectra and time profiles, and how the intensity dependence of the dynamically\ninduced phase leads to a chirp of the harmonic frequency. This phase modulation\ncan be used to control the temporal and spectral properties of the harmonic\nradiation. Temporally, the harmonic chirped pulse can be recompressed to very\nsmall durations. Spectrally, chirping of the fundamental beam may be employed\nto compensate for the dynamically induced chirp and to control the individual\nharmonic spectrum. Finally, we discuss the short pulse effects, in particular\nnonadiabatic phenomena and the possibility of generating attosecond pulses.",
"arxiv_id": "quant-ph/9710060",
"authors": [
"Pascal Sali\u00e8res",
"Anne L\u0027Huillier",
"Philippe Antoine",
"Maciej Lewenstein"
],
"categories": [
"quant-ph"
],
"title": "Study of the spatial and temporal coherence of high order harmonics",
"url": "https://arxiv.org/abs/quant-ph/9710060"
},
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