Title :
High-performance trapped Hg/sup +/ frequency standards
Author :
Berkeland, D.J. ; Miller, J.D. ; Young, B.C. ; Bergquist, J.C. ; Itano, W.M. ; Wineland, D.J.
Author_Institution :
Time & Frequency Div., Nat. Inst. of Stand. & Technol., Boulder, CO, USA
Abstract :
We have demonstrated a new frequency standard, accurate to 3.4/spl times/10/sup -15/, based on the 40.5 GHz ground state hyperfine transition in cooled and trapped /sup 199/Hg/sup +/. We are also developing an optical frequency standard based on /sup 199/Hg/sup +/. The spectral width of the 563 nm laser used in this standard is less than 6 Hz.
Keywords :
Zeeman effect; atomic clocks; frequency stability; frequency standards; ground states; hyperfine structure; laser cooling; measurement uncertainty; mercury (metal); microwave measurement; particle traps; positive ions; radiation pressure; trapped ions; 282 nm; 40.5 GHz; Hg; Paul-Straubel trap; Ramsey spectrum; Zeeman shift; clock transition; cooled trapped /sup 199/Hg/sup +/; electric dipole transitions; frequency stability; ground state hyperfine transition; high-performance frequency standard; ion crystals; laser cooling; linear Paul trap; microwave frequency standard; optical frequency standard; spectral width; trapped ions; uncertainty; Acoustic beams; Frequency synthesizers; Laser beams; Laser stability; Laser transitions; Mercury (metals); Optical scattering; Particle beam optics; Resonance; Resonant frequency;
Conference_Titel :
Precision Electromagnetic Measurements Digest, 1998 Conference on
Conference_Location :
Washington, DC, USA
Print_ISBN :
0-7803-5018-9
DOI :
10.1109/CPEM.1998.699930
