Single attosecond pulse generation in an orthogonally polarized two-color laser field combined with a static electric field
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012 (China)
We investigate theoretic high-order harmonic generation and single attosecond pulse generation in an orthogonally polarized two-color laser field, which is synthesized by a mid-infrared (IR) pulse (12.5 fs, 2000 nm) in the y component and a much weaker (12 fs, 800 nm) pulse in the x component. We find that the width of the harmonic plateau can be extended when a static electric field is added in the y component. We also investigate emission time of harmonics in terms of a time-frequency analysis to illustrate the physical mechanism of high-order harmonic generation. We calculate the ionization rate using the Ammosov-Delone-Krainov model and interpret the variation of harmonic intensity for different static electric field strengths. When the ratio of strengths of the static and the y-component laser fields is 0.1, a continuous harmonic spectrum is formed from 220 to 420 eV. By superposing a properly selected range of the harmonic spectrum from 300 to 350 eV, an isolated attosecond pulse with a duration of about 75 as is obtained, which is near linearly polarized.
- OSTI ID:
- 21408656
- Journal Information:
- Physical Review. A, Vol. 81, Issue 4; Other Information: DOI: 10.1103/PhysRevA.81.043420; (c) 2010 The American Physical Society; ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COLOR
ELECTRIC FIELDS
EMISSION
EV RANGE
FREQUENCY ANALYSIS
HARMONIC GENERATION
HARMONICS
IONIZATION
LASER RADIATION
PULSES
SPECTRA
VARIATIONS
ELECTROMAGNETIC RADIATION
ENERGY RANGE
FREQUENCY MIXING
OPTICAL PROPERTIES
ORGANOLEPTIC PROPERTIES
OSCILLATIONS
PHYSICAL PROPERTIES
RADIATIONS