Preprint Communication Version 1 Preserved in Portico This version is not peer-reviewed

A Miniature Permanent Magnet Assembly with Localized and Uniform Field with an Application to Optical Pumping of Helium

Version 1 : Received: 25 August 2021 / Approved: 26 August 2021 / Online: 26 August 2021 (10:03:32 CEST)

How to cite: Cameron, G.; Cuevas, J.; Pound Jr., J.; Shiner, D. A Miniature Permanent Magnet Assembly with Localized and Uniform Field with an Application to Optical Pumping of Helium. Preprints 2021, 2021080504 (doi: 10.20944/preprints202108.0504.v1). Cameron, G.; Cuevas, J.; Pound Jr., J.; Shiner, D. A Miniature Permanent Magnet Assembly with Localized and Uniform Field with an Application to Optical Pumping of Helium. Preprints 2021, 2021080504 (doi: 10.20944/preprints202108.0504.v1).

Abstract

Atomic state preparation can benefit from a compact and uniform magnetic field source. Simulations and experimental measurements have been used to design, build, and test such a source as shown by optical pumping of atomic Helium. This source is a 9.5 mm (3/8") OD x 6.7 mm (1/4") ID x 9.5 mm (3/8") long, NdFeB-N42 assembly of 1.6 mm (1/16") thick customized annular magnets. It has octopole decay with a residual dipole far field from imperfect dipole cancelations. It has greater than 50% clear aperture with uniform and collimated magnetic field consistent with the prediction of several models. Octopole roll-off localizes the field minimizing the need for shielding in applications. The device is applied to a high precision 3,4He laser spectroscopy experiment using σ+ or σ- optical pumping currently resulting in a measured 99.3% preparation efficiency and in accordance with a rate-equation model.

Keywords

optical pumping; annular permanent magnet; miniature magnet; laser orbital angular mo-mentum; collimated magnetic field; fringe magnetic field

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