Abstract

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