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Title: Quasi-supercontinuum source in the extreme ultraviolet using multiple frequency combs from high-harmonic generation

A quasi-supercontinuum source in the extreme ultraviolet (XUV) is demonstrated using a table-top femtosecond laser and a tunable optical parametric amplifier (OPA) as a driver for high-harmonic generation (HHG). The harmonic radiation, which is usually a comb of odd multiples of the fundamental frequency, is generated by near-infrared (NIR) laser pulses from the OPA. A quasi-continuous XUV spectrum in the range of 30 to 100 eV is realized by averaging over multiple harmonic comb spectra with slightly different fundamental frequencies and thus different spectral spacing between the individual harmonics. The driving laser wavelength is swept automatically during an averaging time period. With a total photon flux of 4×10 9 photons/s in the range of 30 eV to 100 eV and 1×10 7 photons/s in the range of 100 eV to 200 eV, the resulting quasi-supercontinuum XUV source is suited for applications such as XUV coherence tomography (XCT) or near-edge absorption fine structure spectroscopy (NEXAFS).
Authors:
 [1] ;  [1] ;  [2] ;  [2] ;  [1] ;  [3] ;  [1]
  1. Friedrich Schiller Univ. Jena (Germany). Inst. of Optics and Quantum Electronics; Helmholtz Inst. Jena (Germany)
  2. Friedrich Schiller Univ. Jena (Germany). Inst. of Optics and Quantum Electronics
  3. Friedrich Schiller Univ. Jena (Germany). Inst. of Optics and Quantum Electronics; SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Grant/Contract Number:
PA-730/5; 2015FGR0094; 501100001663
Type:
Accepted Manuscript
Journal Name:
Optics Express
Additional Journal Information:
Journal Volume: 25; Journal Issue: 6; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America (OSA)
Research Org:
Friedrich Schiller Univ. Jena (Germany); Helmholtz Inst. Jena (Germany); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE; German Research Foundation (DFG); Thuringer Aufbaubank (Germany); Helmholtz Inst. Jena (Germany); German Federal Ministry of Education and Research (BMBF); Volkswagen Foundation (Germany)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; Frequency combs; Infrared radiation; Photon counting; Stray light; Supercontinuum sources; Synchrotron radiation
OSTI Identifier:
1361124