Brunel harmonics generated from ionizing clusters by few-cycle laser pulses

We study theoretically harmonic generation from ionizing nano-clusters irradiated by intense few-cycle laser pulses and identify a Brunel-type harmonic generation mechanism that originates from subcycle ionization dynamics in clusters. Compared to Brunel harmonics in gases, the spectra are shifted t...

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Bibliographic Details
Published in:Optics letters 2019-02, Vol.44 (4), p.779-782
Main Authors: Gao, Xiaohui, Shim, Bonggu, Downer, Michael C
Format: Article
Language:English
Subjects:
Clusters
Harmonic generations
Ionization
Lasers
Phase matching
Plasmas
Ultraviolet radiation
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Summary:We study theoretically harmonic generation from ionizing nano-clusters irradiated by intense few-cycle laser pulses and identify a Brunel-type harmonic generation mechanism that originates from subcycle ionization dynamics in clusters. Compared to Brunel harmonics in gases, the spectra are shifted toward odd-order harmonics of Mie frequency ω due to efficient excitation of Mie oscillations. Considering the appreciable single-cluster harmonic yield and the relaxed phase-matching condition in overdense clustered plasmas, clusters driven by few-cycle laser pulses can be a promising source of vacuum-ultraviolet radiation.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.44.000779