Title :
A cryogenic linear ion trap for /sup 199/Hg/sup +/ frequency standards
Author :
Miller, J.D. ; Poitzsch, M.E. ; Cruz, F.C. ; Berkeland, D.J. ; Bergquist, J.C. ; Itano, W.M. ; Wineland, D.J.
Author_Institution :
Time & Freq. Div., Nat. Inst. of Stand. & Technol., Boulder, CO, USA
fDate :
May 31 1995-June 2 1995
Abstract :
A cryogenic linear rf trap has been constructed to study the accuracy of a clock based on laser cooled /sup 199/Hg/sup +/. Crystals of tens of ions have been observed. The residual micromotion of the ions has been minimized and Ramsey interrogation periods of 25 s have been demonstrated for the 40.5 GHz transition. This system should eventually provide a frequency standard of high precision and accuracy. We report on the development of compact, efficient, solid-state sources at 194 nm and 282 nm for laser cooling of /sup 199/Hg/sup +/ and investigation of the /sup 2/S/sub 1/2//spl rarr//sup 2/D/sub 5/2/ quadrupole transition of interest for an optical frequency standard.
Keywords :
atomic clocks; cryogenics; frequency measurement; low-temperature techniques; measurement standards; mercury (metal); particle traps; positive ions; radiation pressure; trapped ions; /sup 199/Hg/sup +/ ions; 194 nm; 282 nm; 40.5 GHz; Hg; Ramsey interrogation; clock; cryogenic linear RF trap; ion crystals; laser cooling; optical frequency standard; quadrupole transitions; solid-state source; Clocks; Cooling; Cryogenics; Crystals; Frequency; Laser transitions; Mercury (metals); Solid lasers; Solid state circuits; Standards development;
Conference_Titel :
Frequency Control Symposium, 1995. 49th., Proceedings of the 1995 IEEE International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-2500-1
DOI :
10.1109/FREQ.1995.483889
