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We have developed a radio-frequency (RF) dissemination system using optical fibers. The phase noise induced during the transmission is actively cancelled by the compensation system with a voltage-controlled crystal oscillator. A first proving test was conducted on an urban telecom fiber link with a length of 10 km, and a frequency stability of 1 X 10-17 was achieved at an averaging time of one day...
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...
A narrow linewidth diode laser is being developed. The laser linewidth is reduced to 66 Hz. The long term frequency drift is reduced 0.5 Hz per second, measured by Gigajet 20 W optical frequency comb.
National institute of information and communications technology (NICT) has developed Cs atomic fountain frequency standards aiming at contributing to improve the accuracy of International Atomic Time (TAI) and Japan Standard Time. They are called NICT-CsF1 and NICT-CsF2. The accuracy evaluation of CsF1 has been completed and a type B uncertainty of 1.9times10-15 has been achieved. NICT-CsF2 is under...
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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