Title :
Optical frequency standard based on cold Ca atoms: phase coherent frequency measurement
Author :
Schnatz, H. ; Lipphardt, B. ; Helmcke, J. ; Riehle, F. ; Trebst, T. ; Zinner, G.
Author_Institution :
Physikalisch Tech. Bundesanstalt, Braunschweig, Germany
Abstract :
We have determined the frequency of the /sup 3/P/sub 1/-/sup 1/S/sub 0/ intercombination transition of atomic /sup 40/Ca stored in a magneto- optical trap to be v=455 986 240 493. 95 kHz with an estimated relative standard uncertainty below 10/sup -12/ using a phase-coherent optical frequency chain from the Cs atomic clock to the visible. This allows the realization of the meter by visible frequencies with 25-fold reduced uncertainty compared to previous measurements.
Keywords :
calcium; dye lasers; frequency measurement; laser frequency stability; magneto-optical devices; measurement errors; measurement standards; radiation pressure; /sup 3/P/sub 1/-/sup 1/S/sub 0/ intercombination transition; 455986240493.95 kHz; Ca; atomic clock; laser frequency stability; magneto- optical trap; optical frequency standard; phase coherent frequency measurement; relative standard uncertainty; visible frequencies; Atom lasers; Atom optics; Atomic beams; Atomic measurements; Frequency measurement; Laser stability; Laser transitions; Measurement standards; Optical interferometry; Optical modulation;
Conference_Titel :
Precision Electromagnetic Measurements Digest, 1996 Conference on
Conference_Location :
Braunschweig, Germany
Print_ISBN :
0-7803-3376-4
DOI :
10.1109/CPEM.1996.546766
