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23 February 2009 Frequency doubling of a single-frequency 778-nm Ti:Sapphire laser for nuclear spin polarization of 3He atoms
Shingo Maeda, Yutaka Tabata, Hiroshi Morioka, Hiroshi Kumagai, Ataru Kobayashi
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Proceedings Volume 7197, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VIII; 71970W (2009) https://doi.org/10.1117/12.808135
Event: SPIE LASE: Lasers and Applications in Science and Engineering, 2009, San Jose, California, United States
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.
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Shingo Maeda, Yutaka Tabata, Hiroshi Morioka, Hiroshi Kumagai, and Ataru Kobayashi "Frequency doubling of a single-frequency 778-nm Ti:Sapphire laser for nuclear spin polarization of 3He atoms", Proc. SPIE 7197, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VIII, 71970W (23 February 2009); https://doi.org/10.1117/12.808135
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KEYWORDS
Crystals
Nonlinear crystals
Second-harmonic generation
Spin polarization
Chemical species
Laser crystals
Light sources
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