Quadrupole Transition Spectrum Measurement of Single Ca+ Ions Toward Optical Frequency Standards

Kensuke Matsubara, Ying Li, Kyoya Fukuda, Hiroyuki Ito, Shigeo Nagano, Masatoshi Kajita, Kazuhiro Hayasaka, Shinji Urabe, Mizuhiko Hosokawa

Abstract:	The National Institute of Information and Communications Technology in Japan is proceeding with development of an optical frequency standard using an electric quadrupole transition of Ca+ ions in a small radio-frequency trap. The single, trapped 40Ca+ ions are lasercooled to a temperature of <10 mK using extended-cavity diode lasers at 397 nm and 866 nm. In order to measure the electric quadrupole transition, the linewidth of the clock laser diode at 729 nm is reduced to ~66 Hz using an ultra-low-expansion (ULE) cavity. We observed the electric quadrupole transition with a linewidth of ~600 kHz, together with the ionic motional sidebands. We are also developing optical frequency combs without photonic fibers broadening the spectrum. The experimental is now improved in order to observe the narrower linewidth of the quadrupole transition
Published in:	Proceedings of the 38th Annual Precise Time and Time Interval Systems and Applications Meeting December 7 - 9, 2006 Hyatt Regency Reston Town Center Reston, Virginia
Pages:	123 - 136
Cite this article:	Matsubara, Kensuke, Li, Ying, Fukuda, Kyoya, Ito, Hiroyuki, Nagano, Shigeo, Kajita, Masatoshi, Hayasaka, Kazuhiro, Urabe, Shinji, Hosokawa, Mizuhiko, "Quadrupole Transition Spectrum Measurement of Single Ca+ Ions Toward Optical Frequency Standards," Proceedings of the 38th Annual Precise Time and Time Interval Systems and Applications Meeting, Reston, Virginia, December 2006, pp. 123-136.
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