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AIP conference proceedings

The polarization of an atomic Na beam by laser optical pumping

L. W. Anderson, Jack T. Cusma

Published Jan 1, 1984• 0 citations
Publisher

Abstract

A highly polarized atomic 23Na beam is produced by optical pumping using either a multimode cw dye laser or a single mode ring dye laser followed by a double pass acousto‐optic modulator. Electron spin polarizations of 0.72 to 0.90 are obtained.
DOI
10.1063/1.34602

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Physical Review Letters•Sep 20, 1982•38 citations
A highly polarized 23Na^{23}\mathrm{Na}23Na atomic beam is produced by optical pumping with the use of either a multimode cw dye laser or a single-mode ring dye laser followed by a double-passed acousto-optic modulator. Electron-spin polarizations of 0.72 to 0.90 are obtained.
We describe optically pumping a beam of sodium atoms to >96% mS and >92% mS, mI state selection. (We have accurately measured the population of every mS, mI state in the optically pumped beam.) For the optical pumping both ground hyperfine states are pumped, using single-mode cw dye-laser radiation tuned to the 3S1/2–3P1/2 transition that is phase modulated in a LiTaO3 crystal to produce first-order sidebands at approximately the 1772-MHz hyperfine splitting of the ground state. The z-directed optical pumping is performed in a z-directed magnetic field of ~5 G. The state-selected atoms then move, in ~1 cm, into an ~200 G, z-directed field. The downstream probe laser beam is scanned through the 3S1/2 (mS, mI) → 3P3/2 (mS′, mI) transitions, which are spectroscopically resolved at 200 G, and the fluorescence intensities portray the residual populations in each of the eight 3S1/2 states.
Optical pumping by a single-frequency cw ring dye laser of thick sodium vapor targets (NL>1013\mathrm{NL}>{10}^{13}NL>1013 atoms/cm2{\mathrm{cm}}^{2}cm2) without buffer gas has been investigated for application in a polarized ion source. The atomic polarization of the sodium was determined from the optical rotation of a second dye laser tuned midway between the DDD lines. Rate-equation calculations reproduce the experimental data and predict very high polarizations (P> 0.8P>~0.8P> 0.8) with the use of one or more single-frequency dye lasers in thick alkali-metal vapor targets.