We investigate high-order-harmonic generation of isotropically distributed gas-phase H₂O molecules exposed to an intense laser field. The induced dipole of each individual molecule by the laser field is first calculated using the recently developed quantitative rescattering theory. In a thin medium, harmonic spectra generated coherently from all the molecules are then calculated by solving Maxwell's equation of propagation. By using accurate transition dipoles of H₂O, we show that the harmonics in the lower plateau region are quite different from models that employ the simpler strong-field approximation. We also examine the magnitude and phase of the harmonics and their dependence on laser focusing conditions.
S. Zhao et al., "High-Order-Harmonic Generation using Gas-Phase H₂O Molecules," Physical Review A - Atomic, Molecular, and Optical Physics, vol. 83, no. 3, American Physical Society (APS), Mar 2011.
The definitive version is available at https://doi.org/10.1103/PhysRevA.83.033409
Keywords and Phrases
Gasphase; Harmonic Spectrum; High-Order; Induced Dipoles; Intense Laser Field; Laser Fields; Laser Focusing; Maxwell's Equations; Plateau Region; Rescattering; Strong-Field Approximations; Transition Dipole, Harmonic Generation; Laser Theory; Maxwell Equations; Molecules, Harmonic Analysis
International Standard Serial Number (ISSN)
Article - Journal
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