Abstract
The injection of a weak resonant field on a superradiant sample can induce large changes in the delay and spatial pattern of the emission. By measuring the change in direction of the emission lobes as a function of the injection field frequency, we have recorded the spectrum of the 7P 3 2 − 7S 1 2 superradiant transition in cesium. As expected from theory, only a few photons per pulse are needed to record the spectrum. Various applications to very sensitive spectroscopy and to amplifier technology are discussed.
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