Implementation of large momentum transfer without swapping the directions of the Raman beams
arxiv(2024)
摘要
Large momentum transfer (LMT) is an important technique for magnifying the
phase shift accumulated in an atom interferometer. Existing approaches to
implement Raman-transition-based LMT all involve physically swapping the
propagation directions of the two counterpropagating Raman beams repeatedly,
which could significantly complicate the experimental system. Here, we
demonstrate a simpler approach for Raman-transition-based LMT that does not
involve a physical swap of the directions of the Raman beams. In this approach,
both Raman beams are retroreflected, and a Doppler shift induced by a bias
velocity of the atoms is used to separate the transition frequencies of the two
pairs of counterpropagating Raman beams. Therefore, an effective swap of the
directions of the Raman beams can be achieved by shifting the relative
frequency between the two Raman beams from the resonant frequency of one pair
of the Raman beams to that of the other pair. We demonstrate the use of this
technique for LMT-augmented accelerometry using atoms released from a
magneto-optic trap.
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