Nuclear spin polarization of 3He atoms with a frequency doubled Ti:sapphire laser toward nuclear magnetic resonance of porous media

Y. Tabata; H. Yamada; S. Maeda; H. Morioka; H. Kumagai; A. Kobayashi

doi:10.1117/12.840846

26 February 2010 Nuclear spin polarization of ³He atoms with a frequency doubled Ti:sapphire laser toward nuclear magnetic resonance of porous media

Y. Tabata, H. Yamada, S. Maeda, H. Morioka, H. Kumagai, A. Kobayashi

Author Affiliations +

Proceedings Volume 7586, Synthesis and Photonics of Nanoscale Materials VII; 75860L (2010) https://doi.org/10.1117/12.840846
Event: SPIE LASE, 2010, San Francisco, California, United States

Abstract

NMR based on laser-polarized ³He gases has been attracted as a powerful tool for characterizing physical parameters of porous media and then imaging human lungs. In this paper, the feasibility study of nuclear polarization of ³He atoms utilizing the 2³S-3³P transition at 389 nm is reported in comparison with the conventional 2³S-2³P transition at 1083 nm. The 389-nm light has been available readily with the development of various indium gallium nitride light-emitting diodes (InGaN LEDs). In this work, the frequency-doubled light of a 778-nm CW Ti:sapphire laser with the nonlinear crystal (BiB₃O₆) was used as the optical pumping light at 389 nm. The other light from a Littrow external cavity diode laser was also used for optical pumping at the 1083-nm wavelength and then measurement of the nuclear polarization. The nuclear polarization of 1.8% with optical pumping at the 23S-33P transition was demonstrated and then it was found that the (2³S₁, F=1/2)-(3³P₀, F=1/2) transition was the most efficient transition of 2³S-3³P lines for the magnetic field of 1.6 mT and the gas pressure of 0.5 Torr.

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Y. Tabata, H. Yamada, S. Maeda, H. Morioka, H. Kumagai, and A. Kobayashi "Nuclear spin polarization of ³He atoms with a frequency doubled Ti:sapphire laser toward nuclear magnetic resonance of porous media", Proc. SPIE 7586, Synthesis and Photonics of Nanoscale Materials VII, 75860L (26 February 2010); https://doi.org/10.1117/12.840846

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KEYWORDS

Polarization

Chemical species

Absorption

Optical pumping

Sapphire lasers

Mirrors

Magnetism

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