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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 have developed a simple laser system for generation of coherent 556 nm light by using frequency doubling of a diode laser. 1112 nm light from an external cavity diode laser is amplified via Yb-doped fiber amplifier and 200 mW of the amplified light is injected to wave-guided MgO-doped PPLN, which produces a 30 mW green light. The frequency diode laser is stabilized to a resonance peak of a high-finesse...
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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