High-harmonic generation and parametric amplification in the soft X-rays from extended electron trajectories.

Abstract:

:We report, for the first time, the generation of high-order harmonics in a spectral range between 200 eV and 1 keV with an unusual spectral property: only every 4(th) (4i + 1, i∈ℵ) harmonic line appears, whereas the usual high-harmonic spectra consist of every odd (2i + 1) harmonic. We attribute this unique property to the quantum path interference of two extended electron trajectories that experience multiple re-scattering. In the well-established theory, electrons emitted via tunnel ionisation are accelerated by a laser field, return to the ion and recombine. The acceleration typically lasts for less than one optical cycle, and the electrons radiate in the extreme ultraviolet range at recombination. In contrast, for extended trajectories, electrons are accelerated over two or more optical cycles. Here, we demonstrate that two sets of trajectories dominate and provide substantial contributions to the generated soft X-ray radiation because they fulfil the resonance condition for X-ray parametric amplification.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Seres J,Seres E,Landgraf B,Ecker B,Aurand B,Kuehl T,Spielmann C

doi

10.1038/srep04234

subject

Has Abstract

pub_date

2014-02-28 00:00:00

pages

4234

issn

2045-2322

pii

srep04234

journal_volume

4

pub_type

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