High density terahertz frequency comb produced by coherent synchrotron radiation

S. Tammaro, O. Pirali, P. Roy, J.-F. Lampin, G. Ducournau, A. Cuisset, F. Hindle and G. Mouret ()
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S. Tammaro: AILES Beamline, Synchrotron SOLEIL, l’Orme des Merisiers
O. Pirali: AILES Beamline, Synchrotron SOLEIL, l’Orme des Merisiers
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

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: 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.

Date: 2015
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DOI: 10.1038/ncomms8733

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