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High-sensitivity detection of two-photon Ramsey fringes at 30 THz by frequency-comb assisted stimulated emission

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5 Author(s)
C. Grain ; Lab. de Phys. des Lasers, Univ. de Paris-Nord, Villetaneuse, France ; A. Shelkovnikov ; A. Amy-Klein ; R. J. Butcher
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Spectacular improvements in both resolution and signal-to-noise ratio of two-photon Ramsey fringes obtained at 30 THz have been achieved by implementing a new detection scheme. A molecular beam of SF6, after passing through the Ramsey regions, is interrogated by a separate laser beam which makes optimal use of the entire Doppler profile by generating a comb of frequencies within a compensated high-finesse cavity. Resulting molecular spectra have the highest resolution ever obtained with CO2 lasers and, as a standard, the system will soon outperform the best currently available.

Published in:

IEEE Journal of Quantum Electronics  (Volume:38 ,  Issue: 10 )