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We developed an 171Yb optical lattice clock and measured the absolute frequency of the optical clock transition 1S0 (F = 1/2) − 3P0 (F = 1/2). The frequency was determined at 518 295 836 590 865.7 (9.2). The uncertainty is equivalent to 1.8×10−14 relatively. The magic wavelength of lattice laser was founded at 394 798.18(79) Hz.
We present a current status of a Rb/Cs double fountain clock developing at KRISS. Fountain clock has cooling laser beam with (111)-geometry so as to enlarge cooling beam diameter. Currently few 107 Cs atoms are trapped and cooled in MOT. And we observed Ramsey fringes. The linewith of central Ramsey fringe was measured to be 1 Hz with the S/N of 600.
The selected and amplified optical frequency comb by using diode laser is used in an optical clock configuration to measure the absolute frequency of stabilized ECDL. The ECDL is stabilized to F = 4 → F = 5 transition line of cesium D2 line with modulation transfer spectroscopy. The measured frequency is fECDL = 351 721 960 529 kHz with a statistical uncertainty of 3.5 kHz.
We obtained fline = (351, 721, 960, 559 39) kHz, kappa = 1, as the absolute frequency of F = 4 rarr F' = 5 transition of cesium D2 line by measuring the frequency of an external cavity diode laser (ECDL) locked to the center of the line with frequency modulation transfer technique. The frequency of ECDL was measured by an optical frequency synthesizer based on a 1-GHz femtosecond laser system linked...
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