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arXiv:1008.4151 · Physical Review C

Dressed spin of polarized 3 He in a cell

P.-H. Chu, Andrea Esler, J. C. Peng, BECK Douglas howard, Danielle E. Chandler, Steven M. Clayton, B.-Z. Hu, S. Y. Ngan, C. H. Sham, Lok‐hang So, S. Williamson, Jacob L. Yoder

Published Aug 19, 2011• 15 citations
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Abstract

We report a measurement of the modification of the effective precession frequency of polarized ${}^{3}$He atoms in response to a dressing field in a room-temperature cell. The ${}^{3}$He atoms were polarized using the metastability spin-exchange method. An oscillating dressing field was then applied perpendicular to the constant magnetic field. Modification of the ${}^{3}$He effective precession frequency was observed over a broad range of the amplitude and frequency of the dressing field. The observed effects are compared with calculations based on quantum optics formalism.

DOI
10.1103/physrevc.84.022501

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We report a measurement of dressed spin effects of polarized 3He^{3}\mathrm{He}3He atoms from a cold atomic source traversing a region of a constant magnetic field B0{B}_{0}B0​ and a transverse oscillatory dressing field ${B}_{d}\mathrm{cos}{\ensuremath{\omega}}_{d}t$. The observed effects are compared with a numerical simulation using the Bloch equation as well as a calculation based on the dressed atom formalism. An application of the dressed spin of 3He^{3}\mathrm{He}3He for a proposed neutron electric dipole moment measurement is also discussed.
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A typical magnetic-resonance scheme employs a static bias magnetic field and an orthogonal driving magnetic field oscillating at the Larmor frequency, at which the atomic polarization precesses around the static magnetic field. Here we demonstrate both theoretically and experimentally the variations of the resonance condition and the spin precession dynamics resulting from the parametric modulation of the bias field. We show that the driving magnetic field with the frequency detuned by different harmonics of the parametric modulation frequency can lead to resonance as well. Also, a series of frequency sidebands centered at the driving frequency and spaced by the parametric modulation frequency can be observed in the precession of the atomic polarization. We further show that the resonant amplitudes of the sidebands can be controlled by varying the ratio between the amplitude and the frequency of the parametric modulation. These effects could be used in different atomic magnetometry applications.
Abstract We present a systematic analysis to explain the observed magnetic resonance spectrum with three or five peaks spaced at Rabi frequency when the metastable 3 He atoms are probed with a transverse circularly or linearly polarized 1083 nm laser beam, respectively. The resonance signals are generated in the ground state of 3 He atoms, dressed by a resonant magnetic field, and transferred to the metastable state by collisions. The triplet spectrum is thought to be the result of the linear coupling between the metastable state and the ground state, while the quintuplet is thought to be that of the nonlinear coupling, and indicates that higher-order atomic polarization is created during the atomic collisions. More features of the magnetic resonance signals are investigated.