Influence of gas pressure on high-order harmonic generation of Ar and Ne

Details Influence of gas pressure on high-order harmonic generation of Ar and Ne Influence of gas pressure on high-order harmonic generation of Ar and Ne

2011-07-29

arxiv.org/abs/1107.6018v1

Phys. Rev. A 84, 053404 (2011)

Physics

Atomic Physics

7 figures

Scientific paper

10.1103/PhysRevA.84.053404

We study the effect of gas pressure on the generation of high-order harmonics where harmonics due to individual atoms are calculated using the recently developed quantitative rescattering theory, and the propagation of the laser and harmonics in the medium is calculated by solving the Maxwell's wave equation. We illustrate that the simulated spectra are very sensitive to the laser focusing conditions at high laser intensity and high pressure since the fundamental laser field is severely reshaped during the propagation. By comparing the simulated results with several experiments we show that the pressure dependence can be qualitatively explained. The lack of quantitative agreement is tentatively attributed to the failure of the complete knowledge of the experimental conditions.

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