Hybrid spin-exchange optical pumping of 3He |
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Authors: | Babcock Earl Nelson Ian Kadlecek Steve Driehuys Bastiaan Anderson L W Hersman F W Walker Thad G |
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Affiliation: | Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA. |
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Abstract: | We demonstrate spin-exchange optical pumping of 3He using a "hybrid" K-Rb vapor mixture. The Rb atoms absorb light from a standard laser at 795 nm, then collisionally polarize the potassium atoms. Spin-exchange collisions of K and 3He atoms then transfer the angular momentum to the 3He with much greater efficiency than Rb-3He. For a K-rich vapor, the efficiency of the hybrid spin-exchange collisions approaches 1/4, an order of magnitude greater than achieved by pure Rb pumping. We present the first measurements of actual photon efficiencies (polarized nuclei produced per absorbed photon), and show that a new parasitic absorption process limits the total efficiencies for both hybrid and pure Rb pumping. |
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