title: 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.
authors.affiliation: Department of Physics, Cardwell Hall, Kansas State University, Manhattan, Kansas 66506, USA.
authors.forename: Anh-Thu
authors.initials: AT
authors.lastname: Le
authors.affiliation: Department of Physics, Cardwell Hall, Kansas State University, Manhattan, Kansas 66506, USA.
authors.forename: Hui
authors.initials: H
authors.lastname: Wei
authors.affiliation: Department of Physics, Cardwell Hall, Kansas State University, Manhattan, Kansas 66506, USA.
authors.forename: Cheng
authors.initials: C
authors.lastname: Jin
authors.affiliation: Institute of Engineering Physics, Hanoi University of Science and Technology, 1 Dai Co Viet Road, Hanoi 10000, Vietnam.
authors.forename: Vu Ngoc
authors.initials: VN
authors.lastname: Tuoc
authors.affiliation: Department of Engineering Science, University of Electro-Communications, 1-5-1 Chofu-ga-oka, Chofu-shi, Tokyo 182-8585, Japan.
authors.forename: Toru
authors.initials: T
authors.lastname: Morishita
authors.affiliation: Department of Physics, Cardwell Hall, Kansas State University, Manhattan, Kansas 66506, USA.
authors.forename: C D
authors.initials: CD
authors.lastname: Lin
mesh_terms: D060733:Electromagnetic Radiation; D004583:Electrons; D007259:Infrared Rays; D007834:Lasers; D011789:Quantum Theory; D012542:Scattering, Radiation; D014025:Titanium / Q000737:chemistry
chemical_list: D014025:Titanium