High nuclear polarization in3He and3He-4He gas mixtures by optical pumping with a laser diode期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

High nuclear polarization in3He and3He-4He gas mixtures by optical pumping with a laser diode

Authors:	E. Stoltz M. Meyerhoff N. Bigelow M. Leduc P. -J. Nacher G. Tastevin

Affiliation:	(1) Déparement de Physique de l'Ecole Normale Supérieure, Laboratoire Kastler Brossel, 24 rue Lhomond, F75231 Paris;(2) Present address: Department of Physics and Astronomy and Laboratory for Laser Energetics, University of Rochester, 14627 N.Y., Rochester, USA

Abstract:	New diode lasers delivering 50 mW output power at 1083 nm are shown to be efficient sources for optical pumping of helium. They can polarize nuclei in a³He gas up toM = 50% over the pressure range 0.4–1.6 torr. Larger nuclear polarizationsM of³He nuclei, of order 80%, can be obtained in³He-⁴He mixtures when the laser frequency is tuned to a⁴He line. A standard optical measurement of nuclear polarizationM has been extended to the case of³He-⁴He mixtures. The effect of various parameters on the steady-state polarizationM and on the pumping timeT_p is discussed.Laboratoire associé au Centre National de la Recherche Scientifique et à l'Université P. M. Curie

Keywords:	32.8013 67.65
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