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Quantum Electronics and Laser Science Conference

Large angle atomic beam splitters

Kent S. Johnson, John Lawall, A. P. Chu, T. W. Lynn, Karl K. Berggren, M. S. Shahriar, Mara Goff Prentiss

Published May 22, 1995• 0 citations
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We have used a new technique to construct a clean, large-angle, coherent atomic beam splitter with an easily adjustable splitting angle. Helium atoms in the J=1 metastable state diffract from a far-detuned light field with ‘corkscrew’ polarization in the presence of a homogeneous magnetic field. Adiabatic transfer from magnetic energy to ‘transverse kinetic energy’ then allows symmetric diffraction of the incoming beam in a single, high diffraction order with a different value of M. The order is set by the value of the magnetic field. The result is a flexible, adjustable, large-angle, three-way atomic beam splitter for atom interferometry.
A theory of an atom beam splitter is developed involving the interaction of standing-wave field pulses with $\ensuremath{\Lambda}$-type atoms. The beam splitter consists of two interaction zones, both treated in the Raman-Nath approximation. There is an initial, off-resonant field (or fields) that prepares the initial atomic state, followed by interaction with a pair of standing-wave field pulses. Using this configuration one is able to create a large-angle beam splitter with a significant suppression of unwanted momentum components. The roles of relaxation and a frequency chirp are investigated, as are initial conditions for which both ground states of the $\ensuremath{\Lambda}$ scheme are prepared by the first field. It is shown that the scheme is rather robust against fluctuations of system parameters.