High nuclear polarization in He-3 and He-3-He-4 gas mixtures by optical pumping with a laser diode

Abstract : New diode lasers delivering 50 mW output power at 1083 nm are shown to be efficient sources for optical pumping of helium. They can polarize nuclei in a He-3 gas up to M = 50% over the pressure range 0.4-1.6 torr. Larger nuclear polarizations M of He-3 nuclei, of order 80%, can be obtained in He-3-He-4 mixtures when the laser frequency is tuned to a He-4 line. A standard optical measurement of nuclear polarization M has been extended to the case of He-3-He-4 mixtures. The effect of various parameters on the steady-state polarization M and on the pumping time T-p is discussed.
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https://hal.archives-ouvertes.fr/hal-02016722
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Submitted on : Tuesday, February 12, 2019 - 8:01:40 PM
Last modification on : Saturday, March 23, 2019 - 1:38:31 AM

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  • HAL Id : hal-02016722, version 1

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E. Stolz, M. Meyerhoff, N. Bigelow, M. Leduc, Pierre-Jean Nacher, et al.. High nuclear polarization in He-3 and He-3-He-4 gas mixtures by optical pumping with a laser diode. Applied Physics B: Lasers and Optics, 1996, 63 (6), pp.629--633. ⟨hal-02016722⟩

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