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The European Physical Journal D

The effects of the non-uniformity of Raman laser beams on an atom interferometer

Bing Cheng, Zhaoying Wang, Bin Wu, Aopeng Xu, Qiyu Wang, Qiang Lin

Published Nov 1, 2014• 7 citations
Publisher
DOI
10.1140/epjd/e2014-40698-1

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The uniformity of the intensity and the phase of laser beams is crucial to high-performance atom interferometers. Inhomogeneities in the laser intensity profile cause contrast reductions and systematic effects in interferometers operated with atom sources at micro-Kelvin temperatures and detrimental diffraction phase shifts in interferometers using large momentum transfer beam splitters. We report on the implementation of a so-called top-hat laser beam in a long-interrogation-time cold-atom interferometer to overcome the issue of inhomogeneous laser intensity encountered when using Gaussian laser beams. We characterize the intensity and relative phase profiles of the top-hat beam and demonstrate its gain in atom-optic efficiency over a Gaussian beam, in agreement with numerical simulations. We discuss the application of top-hat beams to improve the performance of different architectures of atom interferometers.