Medium propagation effects in high harmonic generation of Ar and N${}_2$

Abstract

We report theoretical calculations of high harmonic generation (HHG) by intense infrared lasers in atomic and molecular targets taking into account the macroscopic propagation of both fundamental and harmonic fields. On the examples of Ar and N${}_2$, we demonstrate that these {\it ab initio} calculations are capable of accurately reproducing available experimental results with isotropic and aligned target media. We further present detailed analysis of HHG intensity and phase, under various experimental conditions, in particular, as the wavelength of the driving laser changes. Most importantly, our results strongly support the factorization of HHG at the macroscopic level into a product of a returning electron wave packet and the photorecombination transition dipole, under typical experimental conditions. This implies that the single-atom/molecule structure information can be retrieved from experimentally measured HHG spectra.

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Cited by in corpus (17)

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• Attosecond pulse shaping around a Cooper minimum
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• Probing electronic wavefunctions by all-optical attosecond interferometry
• Generation of isolated attosecond pulses in the far field by spatial filtering with an intense few-cycle mid-infrared laser
• Solitary beam propagation in a nonlinear optical resonator enables high-efficiency pulse compression and mode self-cleaning
• Photoabsorption of attosecond XUV light pulses by two strongly laser-coupled autoionizing states
• Separation of Target Structure and Medium Propagation Effects in High-Harmonic Generation
• Analysis of effects of macroscopic propagation and multiple molecular orbitals on the minimum in high-order harmonic generation of aligned CO${}_2$
• Influence of gas pressure on high-order harmonic generation of Ar and Ne
• Generation of broad XUV continuous high harmonic spectra and isolated attosecond pulses with intense mid-infrared lasers
• Extension of the bright high-harmonic photon energy range via nonadiabatic critical phase matching
• High-order harmonic generation in Xe, Kr, and Ar driven by a 2.1-μm source: high-order harmonic spectroscopy under macroscopic effects
• High-order harmonic generation by sub-cycle laser pulses and associated scaling laws
• All-optical spatio-temporal metrology for isolated attosecond pulses
• Classical trajectories in polar-asymmetric laser fields: Synchronous THz and XUV emission
• Ab-initio calculations of laser-atom interactions reveal harmonics feedback during macroscopic propagation