Velocimetry of cold atoms by matterwave interferometry

Carey, Max; Saywell, Jack; Elcock, David; Belal, Mohammad; Freegarde, Tim. 2018 Velocimetry of cold atoms by matterwave interferometry. In: Quantum Optics 2018, Obergurgl, Austria, 25 Feb - 03 March 2018. (Unpublished)

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We present an elegant application of matterwave interferometry to the velocimetry of cold atoms whereby, in analogy to Fourier transform spectroscopy, the 1-D velocity distribution is manifest in the frequency domain of the interferometer output. By using stimulated Raman transitions between hyperfine ground states to perform a three-pulse interferometer sequence, we have measured the velocity distributions of clouds of freely-expanding 85Rb atoms with temperatures of 33 μK and 17 μK. Quadrature measurement of the interferometer output as a function of the temporal asymmetry yields velocity distributions with excellent fidelity. Our technique, which is particularly suited to ultracold samples, compares favourably with conventional Doppler and time-of-flight techniques, and reveals artefacts in standard Raman Doppler methods. The technique is related to, and provides a conceptual foundation of, interferometric matterwave accelerometry, gravimetry and rotation sensing.

Item Type: Publication - Conference Item (Paper)
Date made live: 12 Nov 2019 15:04 +0 (UTC)

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