Observation of Large Atomic-Recoil Induced Asymmetries in Cold Atom Spectroscopy

Details Observation of Large Atomic-Recoil Induced Asymmetries in Cold Atom Spectroscopy Observation of Large Atomic-Recoil Induced Asymmetries in Cold Atom Spectroscopy

2004-01-05

arxiv.org/abs/physics/0401011v1

Physics

Atomic Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevA.71.023404

The atomic recoil effect leads to large (25 %) asymmetries in simple spectroscopic investigations of Ca atoms that have been laser-cooled to 10 microkelvin. Starting with spectra from the more familiar Doppler-broadened domain, we show how the fundamental asymmetry between absorption and stimulated emission of light manifests itself when shorter spectroscopic pulses lead to the Fourier transform regime. These effects occur on frequency scales much larger than the size of the recoil shift itself, and have not been observed before in saturation spectroscopy. These results are relevant to state-of-the-art optical atomic clocks based on freely expanding neutral atoms.

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