Title :
NIST cesium fountain frequency standard: preliminary results
Author :
Meekhof, D.M. ; Jefferts, S.R. ; Lee, D. ; Nelson, C.
Author_Institution :
Div. of Time & Frequency, Nat. Inst. of Stand. & Technol., Boulder, CO, USA
Abstract :
We have designed and constructed a laser-cooled cesium fountain for use as a primary frequency standard. This standard incorporates several unique design features, including a method for mapping the C-field region, a second microwave cavity for use in state preparation and a cavity design with extremely low distributed cavity phase shift. Preliminary results of the evaluation and performance of this device will be discussed, including several novel design features.
Keywords :
atomic clocks; caesium; cavity resonators; frequency standards; hyperfine structure; laser cooling; radiation pressure; C-field region mapping; Cs; NIST standard; Ramsey style excitation; atomic fountain; cavity design; hyperfine levels; laser-cooled cesium fountain; low distributed cavity phase shift; microwave cavity; primary frequency standard; state preparation; Atomic measurements; Feeds; Frequency conversion; Magnetic fields; Masers; Metrology; Microwave devices; NIST; Optical design; Temperature;
Conference_Titel :
Precision Electromagnetic Measurements Digest, 1998 Conference on
Conference_Location :
Washington, DC, USA
Print_ISBN :
0-7803-5018-9
DOI :
10.1109/CPEM.1998.699818
