High-sensitivity detection of two-photon Ramsey fringes at 30 THz by frequency-comb assisted stimulated emission |
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Authors: | Grain C. Shelkovnikov A. Amy-Klein A. Butcher R.J. Chardonnet C. |
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Affiliation: | Lab. de Phys. des Lasers, Univ. de Paris-Nord, Villetaneuse; |
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Abstract: | 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 SF/sub 6/, 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 CO/sub 2/ lasers and, as a standard, the system will soon outperform the best currently available. |
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