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Optics Communications

A new type of resonances in saturated absorption spectroscopy of 3-level systems

M. Himbert, Serge Reynaud, J. Dupont-Roc, Claude N. Cohen-Tannoudji

Published Aug 1, 1979• 12 citations
Publisher
DOI
10.1016/0030-4018(79)90072-5

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We demonstrate a new technique for saturated-absorption spectroscopy by use of copropagating beams that does not have the problem of crossover resonances. The pump beam is locked to a transition, and its absorption signal is monitored while the probe beam is scanned. As the probe comes into resonance with another transition, the pump absorption is reduced and the signal shows a Doppler-free dip. We use this technique to measure hyperfine intervals in the D2 line of 85Rb with a precision of 70 kHz and to resolve hyperfine levels in the D2 line of 39K that are less than 10 MHz apart.