Quadrupole Transition Spectrum Measurement of Single Ca+ Ions Toward Optical Frequency Standards
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 laser cooled 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 2007
- Accession Number
- ADA474260
Entities
People
- Hiroyuki Ito
- Kazuhiro Hayasaka
- Kensuke Matsubara
- Kyoya Fukuda
- Masatoshi Kajita
- Mizuhiko Hosokawa
- Shigeo Nagano
- Shinji Urabe
- Ying Li
Organizations
- Osaka University