Polarization analysis of the light emitted by an optically pumped3He gas

Stoltz, Eric; Villard, Bérengère; Meyerholf, Michael; Nacher, Pierre-Jean

doi:10.1007/bf01831005

Cited by 7 publications

(5 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…32 Although the magnetic shield almost completely avoids the need for compensating coils on the ends of the short solenoid, we found that seven turns were still necessary. At a pressure of 1.3 mbar, the relaxation rate due to magnetic field gradients is 1000 times faster than in the Bullwinkle cell, allowing relaxation tests to be performed on a relatively short time scale.…”

Section: Time Dependence Of the 3 He Polarizationmentioning

confidence: 86%

Polarized neutron reflectometry of a patterned magnetic film with a He3 analyzer and a position-sensitive detector

Chen¹,

Gentile²,

O’Donovan³

et al. 2004

Review of Scientific Instruments

View full text Add to dashboard Cite

Articles you may be interested inDevelopment of a compact in situ polarized 3He neutron spin filter at Oak Ridge National Laboratory Rev. Sci. Instrum. 85, 075112 (2014); 10.1063/1.4890391 One directional polarized neutron reflectometry with optimized reference layer method J. Appl. Phys. 112, 054301 (2012); 10.1063/1.4747913 Polarized reflectometer for the investigation of surface magnetism, the new polarized neutron reflectometer with polarization analysis at the Laboratoire Léon Brillouin Rev.

show abstract

Section: Time Dependence Of the 3 He Polarizationmentioning

confidence: 86%

Polarized neutron reflectometry of a patterned magnetic film with a He3 analyzer and a position-sensitive detector

Chen¹,

Gentile²,

O’Donovan³

et al. 2004

Review of Scientific Instruments

View full text Add to dashboard Cite

show abstract

“…Previous experimenters who have used LCRs in this context have leveraged modulated RF discharge with a lock-in amplifier to isolate the portion of the photocurrent due to the gas excitation [4]. While this technique may be used to improve our methods, we find that light filtration and background subtraction were adequate to achieve the desired accuracy.…”

Section: Light Filtrationmentioning

confidence: 89%

“…This measurement can also be realized using two photodiodes, a linearly polarizing beam splitter cube and a quarterwave plate at 45 • to the cube [4]. The paths through the quarter-wave plate and subsequently transmitted or reflected in the beam-splitter are sensitive to left or right handed polarized light.…”

Section: Measurement Techniquesmentioning

confidence: 99%

Liquid crystal polarimetry for metastability exchange optical pumping of 3He

Maxwell

Epstein

Milner

2014

Nuclear Instruments and Methods in Physics Research Section A:

View full text Add to dashboard Cite

We detail the design and operation of a compact, discharge light polarimeter for metastability exchange optical pumping of 3 He gas near 1 torr under a low magnetic field. The nuclear polarization of 3 He can be discerned from its electron polarization, measured via the circular polarization of 668 nm discharge light from an RF excitation. This apparatus measures the circular polarization of this very dim discharge light using a nematic liquid crystal wave retarder (LCR) and a high-gain, transimpedance amplified Si photodiode. We outline corrections required in such a measurement, and discuss contributions to its systematic error.

show abstract

“…The nuclear polarization of 3 He gas in the optical pumping cell is measured both by the optical and NMR polarimeters. The optical method is based on the analysis of the degree of circular polarization of the 668 nm red light emitted by the discharge in the cell [11]. During the discharge sustained in the helium gas atoms can be transferred to the various excited levels with unperturbed nuclear spin.…”

Section: Gas Production Unitmentioning

confidence: 99%

Magnetic Resonance Imaging at Low Magnetic Field Using Hyperpolarized³He Gas

et al. 2005

View full text Add to dashboard Cite

A low magnetic field magnetic resonance imaging system for small animal lung imaging using hyperpolarized 3 He gas is presented. The hyperpolarized 3 He gas at 1 mbar pressure and 30% polarization is obtained by the metastability exchange optical pumping technique. The magnetic resonance imaging unit is based on a permanent magnet of open geometry, built from a new generation Nd-B-Fe magnetic material. It produces the magnetic field of 88 mT with homogeneity better than 50 ppm in the 10 cm diameter sphere, after application of passive shimming. The magnetic field gradients of 30 mT/m are generated by a set of biplanar, actively shielded gradient coils. The first 1 H images of various biological objects, as well as 3 He images of the rat lung in vivo obtained in the described system are shown. In terms of sensitivity and resolution, the technique is superior to conventional 1 H magnetic resonance imaging, and offers great possibilities in early diagnosis of lung diseases.

show abstract

Polarization analysis of the light emitted by an optically pumped3He gas

Cited by 7 publications

References 5 publications

Polarized neutron reflectometry of a patterned magnetic film with a He3 analyzer and a position-sensitive detector

Polarized neutron reflectometry of a patterned magnetic film with a He3 analyzer and a position-sensitive detector

Liquid crystal polarimetry for metastability exchange optical pumping of 3He

Magnetic Resonance Imaging at Low Magnetic Field Using Hyperpolarized³He Gas

Contact Info

Product

Resources

About

Polarization analysis of the light emitted by an optically pumped3He gas

Cited by 7 publications

References 5 publications

Polarized neutron reflectometry of a patterned magnetic film with a He3 analyzer and a position-sensitive detector

Polarized neutron reflectometry of a patterned magnetic film with a He3 analyzer and a position-sensitive detector

Liquid crystal polarimetry for metastability exchange optical pumping of 3He

Magnetic Resonance Imaging at Low Magnetic Field Using Hyperpolarized3He Gas

Contact Info

Product

Resources

About

Magnetic Resonance Imaging at Low Magnetic Field Using Hyperpolarized³He Gas