NDLI: Magnetic field effects on the 1 083 nm atomic line of helium : Optical pumping of helium and optical polarisation measurement in high magnetic field

Content Provider	Springer Nature Link
Author	Courtade, E. Marion, F. Nacher, P. J. Tastevin, G. Kierswski, K. Dohnalik, T.
Copyright Year	2002
Abstract	The structure of the excited 23S and 23P triplet states of 3He and 4He in an applied magnetic field B is studied using different approximations of the atomic Hamiltonian. All optical transitions (line positions and intensities) of the 1 083 nm 23S- 23P transition are computed as a function of B. The effect of metastability exchange collisions between atoms in the ground state and in the 23S metastable state is studied, and rate equations are derived, for the populations these states in the general case of an isotopic mixture in an arbitrary field B. It is shown that the usual spin-temperature description remains valid. A simple optical pumping model based on these rate equations is used to study the B-dependence of the population couplings which result from the exchange collisions. Simple spectroscopy measurements are performed using a single-frequency laser diode on the 1 083 nm transition. The accuracy of frequency scans and of measurements of transition intensities is studied. Systematic experimental verifications are made for B = 0 to 1.5 T. Optical pumping effects resulting from hyperfine decoupling in high field are observed to be in good agreement with the predictions of the simple model. Based on adequately chosen absorption measurements at 1 083 nm, a general optical method to measure the nuclear polarisation of the atoms in the ground state in an arbitrary field is described. It is demonstrated at B∼ 0.1 T, a field for which the usual optical methods could not operate.
Starting Page	25
Ending Page	55
Page Count	31
File Format	PDF
ISSN	14346060
Journal	The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics
Volume Number	21
Issue Number	1
e-ISSN	14346079
Language	English
Publisher	EDP Sciences, Springer-Verlag, Società Italiana di Fisica
Publisher Date	2002-10-01
Publisher Place	Bologna
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics

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Magnetic field effects on the 1083 nm atomic line of helium optical pumping of helium and optical polarisation measurement in high magnetic field (2008).

Magnetic Field Effects on the 1083 nm Atomic Line of Helium Optical Pumping of Helium and Optical Polarisation Measurement in High Magnetic Field (2008)

Magnetic Field Effects on the 1083 nm Atomic Line of Helium. Optical Pumping of Helium and Optical Polarisation Measurement in High Magnetic Field

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