Tunable lasers for helium optical pumping experiments have been pursued avidly for new applications for spin-polarized ensembles of 3He and 4He.1 These applications include studies of the quantum properties of a degenerate spin-polarized Fermi system, polarized targets for nuclear scattering,2,3 and polarized electron beams, all of which require high pump powers at the helium resonance transition (~1 W, 1083.2 nm) for the optical pumping process.

© 1990 Optical Society of America

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