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We report on an absolute frequency measurement of a single 40Ca+ ion in a linear Paul trap at the 10-15 level. A Cs-referenced frequency comb is used to measure the probe laser exciting the 4s2S1/2 to 3d2D5/2 quadrupole transition at 411 THz. A careful analysis of the estimated systematic shifts is given as well as an outlook on possible improvements.
We have magneto-optically trapped cold ytterbium atoms using an intercombination transition for realizing an optical lattice clock. For this purpose, we have developed a laser-diode-based light source, which is phase-locked to an optical frequency comb, thus attaining both laser frequency stabilization and laser linewidth narrowing.
We report on the development of a compact Cs cell CPT frequency standard operating in the Dicke regime. Combining a double Lambda scheme and a Ramsey interrogation, high contrast fringes whose linewidth depends on the time separating two pulses, are obtained. Compared to the continuous regime, the pulsed interrogation reduces the light shift by a factor 300 and permits to reach frequency stability...
This paper describes the current status of an ytterbium lattice clock under development at KRISS. After the success of 399 nm magneto-optical-trap (MOT) at a temperature 1 mK, we constructed the 2nd stage cooling laser system at a wavelength of 556 nm to cool atoms further down to several muK. We are also developing an ultra-narrow linewidth laser at a wavelength of 578 nm to probe the clock transition...
In this paper, we describe the experiment of using radiation pressure to actively damp a strip torsion pendulum. The radiation source is a 1.5 W Nd:YAG laser with an actively controlled variable attenuator. By controlling the power of the laser, force of nano-newton scale can be generated and used to damp the resonant oscillation of the pendulum. We also quantitatively measured the force due to the...
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