15 May 1998 High-accuracy frequency standards using laser-cooled Hg+ ions
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Abstract
We discuss frequency standards based on laser-cooled 199Hg+ ions confined in cryogenic rf traps. In one experiment, the frequency of a microwave source is served to the ions' ground-state hyperfine transition at 40.5 GHz. For seven ions and a Ramsey free precession time of 100 s, the fractional frequency stability is 3.3 (2) X 10-13 (tau) -1/2 for measurement times (tau) < 2 h. The ground-state hyperfine interval is measured to be 40 507 347 996.841 59 (14) (41) Hz, where the first number in parentheses is the uncertainty due to statistics and systematic errors, and the second is the uncertainty in the frequency of the time scale to which the standard is compared. In a second experiment under development, a strong-binding cryogenic trap will confine a single ion used for an optical frequency standard based on a narrow electric quadrupole transition at 282 nm. The bandwidth of the laser used to drive this transition is less than 10 Hz at 563 nm.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Dana J. Berkeland, Dana J. Berkeland, J. D. Miller, J. D. Miller, Brent C. Young, Brent C. Young, James C. Bergquist, James C. Bergquist, Wayne M. Itano, Wayne M. Itano, David J. Wineland, David J. Wineland, } "High-accuracy frequency standards using laser-cooled Hg+ ions", Proc. SPIE 3270, Methods for Ultrasensitive Detection, (15 May 1998); doi: 10.1117/12.308372; https://doi.org/10.1117/12.308372
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