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Proceedings Paper

Nuclear spin polarization of 3He atoms with a frequency doubled Ti:sapphire laser toward nuclear magnetic resonance of porous media
Author(s): Y. Tabata; H. Yamada; S. Maeda; H. Morioka; H. Kumagai; A. Kobayashi
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Paper 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.

Paper Details

Date Published: 26 February 2010
PDF: 10 pages
Proc. SPIE 7586, Synthesis and Photonics of Nanoscale Materials VII, 75860L (26 February 2010); doi: 10.1117/12.840846
Show Author Affiliations
Y. Tabata, Osaka City Univ. (Japan)
H. Yamada, Osaka City Univ. (Japan)
S. Maeda, Osaka City Univ. (Japan)
H. Morioka, Osaka City Univ. (Japan)
H. Kumagai, Osaka City Univ. (Japan)
A. Kobayashi, Osaka City Univ. (Japan)

Published in SPIE Proceedings Vol. 7586:
Synthesis and Photonics of Nanoscale Materials VII
Jan J. Dubowski; David B. Geohegan; Frank Träger, Editor(s)

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