Wednesday, July 3, 2013

1307.0268 (Gordon D. McDonald et al.)

80hk Momentum Separation with Bloch Oscillations in an Optically Guided
Atom Interferometer

Gordon D. McDonald, Carlos C. N. Kuhn, Shayne Bennetts, John E. Debs, Kyle S. Hardman, John D. Close, Nicholas P. Robins
In this Letter, we demonstrate a momentum separation of 80hk between the arms of a horizontally guided, Mach-Zehnder atom interferometer. A fringe visibility of 7% and a contrast of 19% is seen. Our coherent pulse sequence uses Bloch acceleration in an optical waveguide, an inherently scalable route to large momentum separation and high sensitivity. We maintain coherence at high momentum separation due to both the transverse confinement provided by the guide, and our use of a longitudinally collimated cold-atom cloud. We observe a hold time in our optical waveguide of 10 seconds, limited only by dispersion along the waveguide.
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