Single Ca+ Ion Trapping and Quadrupole Transition Measurement Towards an Optical Frequency Standard

Kensuke Matsubara, Ying Li, Hiroyuki Ito, Shigeo Nagano, Kazuhiro Hayasaka, and Mizuhiko Hosokawa

Abstract:	NICT in Japan is developing an optical frequency standard using a quadrupole transition of single Ca+. After our first measurement, reported at PTTI 2006, we have improved the experimental setup. We have performed laser cooling using two cooling lasers, improved vacuum pressure with an additional getter pump, and introduced a pulse-light sequence to the transition measurement. In consequence, we observed the quadrupole transition with a linewidth of ~25 kHz in magnetic fields. The center frequency between the |4 2S1/2, mj=-1/2> - |3 2D5/2, mj=-3/2> and the |4 2S1/2, mj=1/2> - |3 2D5/2, mj=3/2> components was preliminarily estimated to be 411 042 129 782. 5 ± 1.4 kHz. The measurement will be improved to obtain better uncertainty.
Published in:	Proceedings of the 39th Annual Precise Time and Time Interval Meeting November 27 - 29, 2007 Hyatt Regency Long Beach Long Beach, California
Pages:	257 - 268
Cite this article:	Matsubara, Kensuke, Li, Ying, Ito, Hiroyuki, Nagano, Shigeo, Hayasaka, Kazuhiro, Hosokawa, Mizuhiko, "Single Ca+ Ion Trapping and Quadrupole Transition Measurement Towards an Optical Frequency Standard," Proceedings of the 39th Annual Precise Time and Time Interval Meeting, Long Beach, California, November 2007, pp. 257-268.
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