The polarization of helium (23S1) metastable atoms saturates at 50% when the ensemble is optically pumped with the D0 (23S1-23P0) transition. We have obtained polarizations approaching 100% with a simple, straightforward modification to the conventional experimental arrangement. The addition of a small amount of -polarized D0 light incident on the cell perpendicular to the defining field direction doubles the polarization produced by circularly polarized + light along the field direction. A simple rate-equation model illustrates the enhancement. © 1990 The American Physical Society.
L. D. Schearer and P. Tin, "Enhanced Polarization Of Electron Spins In He4 By Simultaneous Optical Pumping With Circularly And Linearly Polarized Resonance Radiation," Physical Review A, vol. 42, no. 7, pp. 4028 - 4031, American Physical Society, Jan 1990.
The definitive version is available at https://doi.org/10.1103/PhysRevA.42.4028
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01 Jan 1990