Abstract
A theory of an atom beam splitter is developed involving the interaction of standing-wave field pulses with {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 {lambda} scheme are prepared by the first field. It is shown that the scheme is rather robust against fluctuations of system parameters.
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