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High density terahertz frequency comb produced by coherent synchrotron radiation

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  • S. Tammaro

    (AILES Beamline, Synchrotron SOLEIL, l’Orme des Merisiers
    Laboratoire de Physico-Chimie de l’Atmosphère, Université du Littoral Côte d’Opale)

  • O. Pirali

    (AILES Beamline, Synchrotron SOLEIL, l’Orme des Merisiers
    Institut des Sciences Moléculaires d’Orsay, UMR8214 CNRS—Université Paris-Sud)

  • P. Roy

    (AILES Beamline, Synchrotron SOLEIL, l’Orme des Merisiers)

  • J.-F. Lampin

    (Institut d’Electronique de Microélectronique et de Nanotechnologie, UMR8520 CNRS—Université de Lille 1)

  • G. Ducournau

    (Institut d’Electronique de Microélectronique et de Nanotechnologie, UMR8520 CNRS—Université de Lille 1)

  • A. Cuisset

    (Laboratoire de Physico-Chimie de l’Atmosphère, Université du Littoral Côte d’Opale)

  • F. Hindle

    (Laboratoire de Physico-Chimie de l’Atmosphère, Université du Littoral Côte d’Opale)

  • G. Mouret

    (Laboratoire de Physico-Chimie de l’Atmosphère, Université du Littoral Côte d’Opale)

Abstract

Frequency combs have enabled significant progress in frequency metrology and high-resolution spectroscopy extending the achievable resolution while increasing the signal-to-noise ratio. In its coherent mode, synchrotron radiation is accepted to provide an intense terahertz continuum covering a wide spectral range from about 0.1 to 1 THz. Using a dedicated heterodyne receiver, we reveal the purely discrete nature of this emission. A phase relationship between the light pulses leads to a powerful frequency comb spanning over one decade in frequency. The comb has a mode spacing of 846 kHz, a linewidth of about 200 Hz, a fractional precision of about 2 × 10−10 and no frequency offset. The unprecedented potential of the comb for high-resolution spectroscopy is demonstrated by the accurate determination of pure rotation transitions of acetonitrile.

Suggested Citation

  • S. Tammaro & O. Pirali & P. Roy & J.-F. Lampin & G. Ducournau & A. Cuisset & F. Hindle & G. Mouret, 2015. "High density terahertz frequency comb produced by coherent synchrotron radiation," Nature Communications, Nature, vol. 6(1), pages 1-6, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms8733
    DOI: 10.1038/ncomms8733
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