High nuclear polarization of helium-3 at low and high pressure by metastability exchange optical pumping at 1.5 Tesla

Details High nuclear polarization of helium-3 at low and high pressure by metastability exchange optical pumping at 1.5 Tesla High nuclear polarization of helium-3 at low and high pressure by metastability exchange optical pumping at 1.5 Tesla

2003-07-31

arxiv.org/abs/physics/0307154v2

Europhysics Letters 68 (2004) 480

Physics

Atomic Physics

accepted for publication in Europhysics Letters

Scientific paper

10.1209/epl/i2004-10237-y

We perform metastability exchange optical pumping of helium-3 in a strong magnetic field of 1.5 T. The achieved nuclear polarization, from 80% at 1.33 mbar to 25% at 67 mbar, shows a substantial improvement at high pressures with respect to standard low-field optical pumping. The specific mechanisms of metastability exchange optical pumping at high field are investigated, advantages and intrinsic limitations are discussed. From a practical point of view, our results open the way to alternative technological solutions for polarized helium-3 applications and in particular for magnetic resonance imaging of human lungs.

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