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Proceedings Paper

Frequency doubling of a single-frequency 778-nm Ti:Sapphire laser for nuclear spin polarization of 3He atoms
Author(s): Shingo Maeda; Yutaka Tabata; Hiroshi Morioka; Hiroshi Kumagai; Ataru Kobayashi
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Paper Abstract

Optical pumping is the efficient way to polarize a nuclear spin of helium-3 (3He). The nuclear spin polarization of 3He has been often demonstrated in a discharge cell under the low B-field through the metastability exchange optical pumping (MEOP) technique for a short time. Since the appearance of a high power near-infrared light source, optical pumping with a circularly polarized light tuned to the resonant frequency of 23S→23P transition at 1083nm has been investigated extensively. We, however, are focusing on another optical transition 23S1→23P0 at 389nm that has not been investigated yet for the polarization. Therefore, we developed a single-frequency 389-nm coherent light source which enables to optical-pump metastable 3He atoms via the transition. This light source is based on the second harmonic generation of a single-frequency 778-nm CW Ti:Sapphire laser light with a BiB6O3 (BIBO) nonlinear crystal in an external cavity for the enhancement. We have demonstrated very efficient frequency doubling with high conversion efficiency of 56%, which is obtained at the second harmonic generation of 380mW in the cavity and is corresponding to an efficiency of 81%/W, and we examined the optical pumping for the nuclear spin polarization and polarization analysis.

Paper Details

Date Published: 23 February 2009
PDF: 8 pages
Proc. SPIE 7197, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VIII, 71970W (23 February 2009); doi: 10.1117/12.808135
Show Author Affiliations
Shingo Maeda, Osaka City Univ. (Japan)
Yutaka Tabata, Osaka City Univ. (Japan)
Hiroshi Morioka, Osaka City Univ. (Japan)
Hiroshi Kumagai, Osaka City Univ. (Japan)
Ataru Kobayashi, Osaka City Univ. (Japan)

Published in SPIE Proceedings Vol. 7197:
Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VIII
Peter E. Powers, Editor(s)

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