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• W2056545061 abstract "Optical pumping is an efficient method to create electronic orientation in the excited metastable state 2 3 S 1 of helium through the 2 3 S-2 3 P line at 1.08 μm. In the case of 3 He, nuclear polarization builds up in the ground state as a result of hyperfine coupling and metastability exchange collisions. In view of the numerous applications of spin polarized 3 He (magnetometers, targets for nuclear physics, neutron, spin filters and quantum fluids at low temperature), we tried to improve the results of this optical pumping method. The lamp pumped Nd doped LMA lasers were developed. They now deliver up to 5 Watts of continuous power tunable around lμm. The laser activity contains a 10cm long LMA rod doped with 15% Nd and shaped with concave curved ends to compensate for the thermal lensing resulting from lamp heating. A linewidth of 2GHz, matching the Doppler absorption profile of the atoms, is obtained with two uncoated etalons in the laser cavity, tuned by temperature control of the glass. With this laser, nuclear polarizations over 80% were recorded in a gas of pure 3 He at pressures in the torr range. These studies were extended to 3 He- 4 He mixtures. Pumping on one of the 4 He lines results in nuclear polarization of 3 He through metastability exchange collisions between different isotopes. In some cases, higher 3 He polarizations can thus be obtained in 3 He- 4 He mixtures than in pure 3 He. A systematic experimental and theoretical study was carried on with itosopic mixtures of various proportions. One interesting result is the large nuclear polarization obtained at low laser power (over 25% of 3 He polarization per milliwatt of laser power was observed in some situations)." @default.
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• W2056545061 date "1991-12-01" @default.
• W2056545061 modified "2023-10-18" @default.
• W2056545061 title "OPTICAL PUMPING OF 3He and 3He - 4He MIXTURES WITH A HIGH POWER INFRARED LMA LASER" @default.
• W2056545061 doi "https://doi.org/10.1051/jp4:19917146" @default.
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