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arXiv · 1904.08974

Measurement of a $^7$Li tune-out wavelength by phase-patterned atom interferometry

Eric Copenhaver·Kayleigh Cassella·Robert Berghaus·Holger Müller
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Abstract

Atom interferometers typically use the total populations the interferometer's output ports as the signal, but finer spatial structure can contain useful information. We pattern a matter-wave phase profile onto an atomic sample. An interferometer translates the phase into a measurable pattern in the atomic density that we use perform the first direct precision measurement of the $^7$Li tune-out wavelength near 671 nm. Expressed as a detuning from the $|2S_{1/2},F{=}2\rangle{\rightarrow}|2P_{1/2},F'{=}2\rangle$ transition, we find 3329.3(1.4) MHz for the tensor-shifted tune out of the $|2S_{1/2},F{=}2,m_F{=}0\rangle$ state with $σ^\pm$ light polarization and 3310.1(4.9) MHz for the tune out of the the scalar polarizability. This technique may be generalized for directly sensing spatially varying phase profiles.

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Eric Copenhaver, Kayleigh Cassella, Robert Berghaus, Holger Müller. 2019-04-18. Measurement of a $^7$Li tune-out wavelength by phase-patterned atom interferometry. https://doi.org/10.1103/physreva.100.063603

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