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Updated: May 31, 2026

An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
Published on: October 23, 2018
Few-cycle attosecond pulses via periodic resonance interaction with hydrogenlike atoms
V A Polovinkin1, Y V Radeonychev, Olga Kocharovskaya
1Institute of Applied Physics, Russian Academy of Science, 46 Ulyanov Street, Nizhny Novgorod, 603950, Russia. vpolo@appl.sci-nnov.ru
Abstract:
We show that it is possible to produce nearly bandwidth-limited few-cycle attosecond pulses based on periodic resonance interaction of a quasi-monochromatic radiation with the bound states of hydrogenlike atoms. A periodic resonance is provided by a far-off-resonant laser field with intensity much below the atomic ionization threshold via periodic tunnel ionization from the excited states and adiabatic Stark splitting of the excited energy levels. Without external synchronization of the spectral components, it is possible to produce 135 as pulses at 13.5 nm in Li²⁺-plasma controlled by radiation of a mode-locked Nd:YAG laser, as well as 1.25 fs pulses at 122 nm in atomic hydrogen controlled by radiation of a CO₂ laser.
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