The interference fringes of an atomic Ramsey interferometer may be narrowed if the two separated
fields have different frequencies and their phase difference is controlled. For spatially separated fields,
their width depends inversely on the free flight time of ground state atoms before entering the first
field region in addition to the time between the fields. The narrowing effect is stable with respect to
velocity fluctuations and for realistic mode functions. We also show that systematic phase shifts and
phase fluctuations do not aggravate the frequency offset of the standard (one-frequency) Ramsey
method.
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