Measurement and extinction of vector light shifts using interferometry of spinor condensates

A. A. Wood, L. D. Turner, R. P. Anderson

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We use differential Ramsey interferometry of ultracold atoms to characterize the vector light shift (VLS) from a far-off-resonance optical dipole trap at λ=1064 nm. The VLS manifests as a “fictitious” magnetic field, which we perceive as a change in the Larmor frequency of two spinor condensates exposed to different intensities of elliptically polarized light. We use our measurement scheme to diagnose the light-induced magnetic field and suppress it to 2.1(8)×10−4 of its maximum value by making the trapping light linearly polarized with a quarter-wave plate in each beam. Our sensitive measurement of the VLS-induced field demonstrates high-precision, in vacuo interferometric polarimetry of dipole-trapping light and can be adapted to measure vector shifts from other lasers, advancing the application of optically trapped atoms to precision metrology.
Original languageEnglish
Article number052503
Number of pages12
JournalPhysical Review A
Issue number5
Publication statusPublished - 2 Nov 2016

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