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We measured the absolute frequency of the 1S0–3P0 transition of 171Yb atom relative to the SI second with an uncertainty reduced by a factor of 14 compared with our previous measurement. The determined frequency was 518 295 836 590 863.38(57) Hz. The experimental setup is being improved for the independent uncertainty evaluation by measuring the frequency shift coefficients of our own system.
In this paper, we report on the implementation and stability analysis of a drift-compensated frequency synthesizer from a cryogenic sapphire oscillator (CSO) designed for a Cs/Rb atomic fountain clock. The synthesizer has two microwave outputs of 7 and 9 GHz for Rb and Cs atom interrogation, respectively. The short-term stability of these microwave signals, measured using an optical frequency comb...
The development of an Yb optical lattice clock at the Korea Research Institute of Standards and Science (KRISS) is reported with current systematic uncertainty of 2.9×10−16. A highly stable clock laser at 578 nm was developed with a shortterm linewidth of 3.5 Hz. The laser was locked to the clock transition and the fractional frequency stability was 2.0×10−15 at 1s. Collisional frequency shift for...
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 an atomic gravimeter, which is based on Mach-Zehnder-type atom interferometer using stimulated Raman transition, developing at KRISS. Cooling beams with (111) geometric configuration was used for magnetic optical trap (MOT). Rubidium87 (Rb87) atoms are trapped and cooled in MOT. Temperature of the trapped atoms was measured to be about 1.7µK by time of flight measurement...
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.
We demonstrate π phase-gate control of cold rubidium atoms in a magneto-optical trap. For this, we utilize ultrafast pulse-shaping technique, and the quantum interference of two-photon ionization is tested as a function of the phase-gate position.
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