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Bright high-repetition-rate source of narrowband extreme-ultraviolet harmonics beyond 22 eV

Author

Listed:
  • He Wang

    (E. O. Lawrence Berkeley National Laboratory, MS 2-354)

  • Yiming Xu

    (E. O. Lawrence Berkeley National Laboratory, MS 2-354)

  • Stefan Ulonska

    (E. O. Lawrence Berkeley National Laboratory, MS 2-354)

  • Joseph S. Robinson

    (E. O. Lawrence Berkeley National Laboratory, MS 2-354)

  • Predrag Ranitovic

    (E. O. Lawrence Berkeley National Laboratory, MS 2-354)

  • Robert A. Kaindl

    (E. O. Lawrence Berkeley National Laboratory, MS 2-354)

Abstract

Novel table-top sources of extreme-ultraviolet light based on high-harmonic generation yield unique insight into the fundamental properties of molecules, nanomaterials or correlated solids, and enable advanced applications in imaging or metrology. Extending high-harmonic generation to high repetition rates portends great experimental benefits, yet efficient extreme-ultraviolet conversion of correspondingly weak driving pulses is challenging. Here, we demonstrate a highly-efficient source of femtosecond extreme-ultraviolet pulses at 50-kHz repetition rate, utilizing the ultraviolet second-harmonic focused tightly into Kr gas. In this cascaded scheme, a photon flux beyond ≈3 × 1013 s−1 is generated at 22.3 eV, with 5 × 10−5 conversion efficiency that surpasses similar harmonics directly driven by the fundamental by two orders-of-magnitude. The enhancement arises from both wavelength scaling of the atomic dipole and improved spatio-temporal phase matching, confirmed by simulations. Spectral isolation of a single 72-meV-wide harmonic renders this bright, 50-kHz extreme-ultraviolet source a powerful tool for ultrafast photoemission, nanoscale imaging and other applications.

Suggested Citation

  • He Wang & Yiming Xu & Stefan Ulonska & Joseph S. Robinson & Predrag Ranitovic & Robert A. Kaindl, 2015. "Bright high-repetition-rate source of narrowband extreme-ultraviolet harmonics beyond 22 eV," Nature Communications, Nature, vol. 6(1), pages 1-7, November.
  • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms8459
    DOI: 10.1038/ncomms8459
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