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Hannover 2016 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 21: Matter Wave Optics

Q 21.1: Talk

Tuesday, March 1, 2016, 14:30–14:45, a310

Impact of retro–reflective geometries on atomic Bragg diffraction — •Alexander Friedrich1, Enno Giese1, Wolfgang P. Schleich1, and Ernst M. Rasel21Institut für Quantenphysik and Center for Integrated Quantum Science and Technology (IQST), Universität Ulm, Albert-Einstein-Allee 11, D-89081 Ulm, Germany — 2Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover, Germany

Light–pulse based atom interferometry has become a valuable tool for high precision measurements of inertial forces, fundamental constants and tests of the weak equivalence principle. Most light–pulse interferometers rely on either Bragg or Raman diffraction. In both cases wave–front distortions and the effects of mirror vibrations can be reduced by retroreflective setups with two counterpropagating laser pairs from a common optical fibre.  This approach comes at the cost of introducing off–resonant transitions into the diffraction process which contribute to the phase of the matter wave and thereby the interferometer phase. In case of Raman diffraction this so called two–photon light shift is well understood.[1,2] We present an analogue analysis as well as analytic expressions for the two–photon light shift in Bragg diffraction. Furthermore we demonstrate that this behaviour can be significantly improved by appropriately shaping the pulse envelopes.
[1] A. Gauguet et al., Phys. Rev. A 78, 043616 (2008)
[2] T. Lévèque et al., Phys. Rev. Lett. 103, 080405 (2009)

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