Universality of returning electron wave packet in high-order harmonic generation with midinfrared laser pulses

Abstract

We show that a returning electron wave packet in high-order harmonic generation (HHG) with midinfrared laser pulses converges to a universal limit for a laser wavelength above about 3  μm. The results are consistent among the different methods: a numerical solution of the time-dependent Schrödinger equation, the strong-field approximation, and the quantum orbits theory. We further analyze how the contribution from different electron “trajectories” survives the macroscopic propagation in the medium. Our result thus provides a new framework for investigating the wavelength scaling law for the HHG yields.

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Keywords

High-order harmonic generation, Returning electron wave packet, Midinfrared laser pulses, Wavelength scaling law

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