Fundamentals of metastability exchange optical pumping in helium

Advances in metastability exchange optical pumping (MEOP) at high laser powers, but also at high gas pressures and high magnetic field strengths, has provided strong motivation for revisiting the understanding of the limitations of this powerful technique. A comprehensive model has been developed fo...

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Bibliographic Details
Main Authors: Batz, M, Nacher, P -J, Tastevin, G
Format: Conference Proceeding
Language:English
Subjects:
Angular momentum
Atomic Physics
Exchange
Laser pumping
Lasers
Magnetic fields
Mathematical models
Metastability
Metastable state
Optical pumping
Photons
Physics
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Summary:Advances in metastability exchange optical pumping (MEOP) at high laser powers, but also at high gas pressures and high magnetic field strengths, has provided strong motivation for revisiting the understanding of the limitations of this powerful technique. A comprehensive model has been developed for improved description of the combined effects of OP, ME, and relaxation, and of detailed MEOP features observed over the broad range of operating conditions. A brief description is provided, with illustrative comparisons of computed and experimental results. This improved tool is used to explain the excellent photon efficiency of OP obtained at all field strengths. It is combined with an angular momentum budget approach to quantitatively investigate the newly discovered strong OP-enhanced polarisation losses that currently limits MEOP performance.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/294/1/012002