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We developed an optical frequency standard using 40Ca+ with the 4 2S1/2-3 2D5/2 electric quadrupole transition. Its absolute transition frequency is 411 042 129 776 390(7) Hz. The uncertainty is limited by the electric quadrupole shift and ambient magnetic field fluctuation. To determine the absolute transition frequency with a better uncertainty, we have observed two pairs of the symmetrically-splitting...
We have developed a 1 GHz synthesis chain based on a cryogenic sapphire oscillator. The 11.2005 GHz output of the CSO is down-converted for laboratory distribution. The frequency stability of the down-converter itself is 2times10-15 at an averaging time of 1 second. The long-term drift of the CSO is suppressed by referencing it to a hydrogen maser linked to Japan Standard Time. An application of this...
We are proceeding with a development of an optical frequency standard using a 2Sfrac12-2D5/2 electric quadrupole transition of Ca+ ions in a small radio-frequency trap. We have theoretically confirmed that an uncertainty of < 1 times 10-15 is attainable in measurement of the 2Sfrac12 - 2D5/2 transition frequency. Experimentally, we have developed stable laser-diode systems and observed the quantum...
The authors proceed with a research and development of an optical frequency standard based on the 2S1/2 - 2 D5/2 transition of 43Ca+ in a RF trap. For this purpose, motional sidebands of a single 40Ca + ion were observed and a stable laser-diode system for spectroscopy of 43Ca+ are being developed
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