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Intense quasi-monochromatic resonant harmonic generation in the multiphoton ionization regime

Journal Article · · Optica
 [1];  [2];  [3];  [4];  [5];  [1];  [1];  [1]
  1. Inst. National de la Recherche Scientifique–Énergie Matériaux Télécommunications, Quebec (Canada)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Prokhorov General Physics Inst. of the Russian Academy of Sciences, Moscow (Russia); Moscow Inst. of Physics and Technology (National Research Univ.), Moscow (Russia)
  4. Lomonosov Moscow State Univ., Moscow (Russia)
  5. Prokhorov General Physics Inst. of the Russian Academy of Sciences, Moscow (Russia); National Research Inst. for Physical-Technical and Radiotechnical Measurements, Moscow (Russia)
Resonant high-order harmonics, which result in quasimonochromatic extreme ultraviolet light with coherent intensity enhancement involving autoionizing resonances, have been demonstrated from laser-ablated plumes in the tunnel-ionization regime. Here, we demonstrate resonant harmonics in the previously unexplored multiphoton-ionization regime. We demonstrate an intense resonant harmonic from gallium with an intensity enhancement ratio of 714 relative to the neighboring harmonics, achieved without the need for extreme ultraviolet filtering methods, thus preventing a typical photon flux loss of more than 70%. Three-dimensional time-dependent Schrödinger equation calculations reveal that this increase in the enhancement ratio is due to the lowelectron wave packet spreading in the multiphoton-ionization regime. These results reveal a method for increasing the intensity and monochromaticity of intense multimicrojoule femtosecond extreme ultraviolet light and will also facilitate understanding of the involvement of autoionizing resonances in generating resonant harmonics in the multiphoton-ionization regime.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1819444
Journal Information:
Optica, Journal Name: Optica Journal Issue: 8 Vol. 8; ISSN 2334-2536
Publisher:
Optical Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English

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