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. Rasel2 — 1Institut 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)