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Proceedings Paper

Generation of quasi-continuous wave 389-nm coherent light by frequency doubling of a Ti:sapphire laser for nuclear spin polarization of [sup]3[/sup]He atoms
Author(s): Shingo Maeda; Hiroshi Morioka; Tatsuya Ohira; Hiroshi Kumagai; Ataru Kobayashi
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Paper Abstract

Magnetic Resonance Imaging based on the hyperpolarized helium-3 (3He) gas has been attracted as a non-destructive testing technique for the porous media and the medical imaging. In order to produce nuclear spin polarization of 3He, optical pumping is the efficient way using a resonant line. However, there is no resonant light source to the line from the ground state of 3He. Then, we have been focusing on the nuclear spin polarization in a discharge cell using the metastability exchange optical pumping (MEOP) technique. We aim at the optical transition 23S1→23P0 at λ=389nm that has never been investigated for the polarization. Therefore, at first, we developed a single-frequency 389-nm coherent light source based on the second harmonic generation of a single-frequency 778-nm continuous-wave Ti:sapphire laser light with a BiB3O6 (BiBO) nonlinear crystal in an external cavity for the enhancement. As a result, we obtained the 389- nm output radiation with the high conversion efficiency of 56%. Additionally, we also demonstrated the frequency doubling of a quasi-continuous wave Ti:sapphire laser for the optical pumping of multiple optical transitions.

Paper Details

Date Published: 17 February 2010
PDF: 9 pages
Proc. SPIE 7582, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications IX, 75820N (17 February 2010); doi: 10.1117/12.840810
Show Author Affiliations
Shingo Maeda, Osaka City Univ. (Japan)
Hiroshi Morioka, Osaka City Univ. (Japan)
Tatsuya Ohira, Osaka City Univ. (Japan)
Hiroshi Kumagai, Osaka City Univ. (Japan)
Ataru Kobayashi, Osaka City Univ. (Japan)

Published in SPIE Proceedings Vol. 7582:
Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications IX
Peter E. Powers, Editor(s)

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