Abstract-Coherent synchrotron radiation for broadband terahertz spectroscopy

J. Barros¹, C. Evain², L. Manceron¹, J.-B. Brubach¹, M.-A. Tordeux¹, P. Brunelle¹, L. Nadolski¹, A. Loulergue¹, M.-E. Couprie¹, S. Bielawski², C. Szwaj², and P. Roy¹

¹Synchrotron SOLEIL, Saint Aubin, BP 48, 91192 Gif-sur-Yvette, Cedex, France
²Laboratoire de Physique des Lasers, Atomes et Molécules, Université des Sciences et Technologies de Lille, F-59655 Villeneuve d’Ascq Cedex, France                        

We present the first high resolution (10⁻³ cm⁻¹) interferometric measurements in the 200–750 GHz range using coherent synchrotron radiation, achieved with a low momentum compaction factor. The effect of microbunching on spectra is shown, depending on the bunch current. A high signal-to-noise ratio is reached thanks to an artifact correction system based on a double detection scheme. Combined to the broad emitted spectral range and high flux (up to 10⁵ times the incoherent radiation), this study demonstrates that coherent synchrotron radiation can now be used for stability-demanding applications, such as gas-phase studies of unstable molecules.

© 2013 American Institute of Physics