Title :
The optical Ca frequency standard
Author :
Riehle, F. ; Schnatz, H. ; Lipphardt, B. ; Zinner, G. ; Trebst, T. ; Binnewies, T. ; Wilpers, G. ; Helmcke, J.
Author_Institution :
Phys. Tech. Bundesanstalt, Braunschweig, Germany
Abstract :
PTB operates an optical wavelength/frequency standard by stabilizing the frequency of a laser to the intercombination transition 3P1-1S0 of laser cooled ballistic atomic 40Ca at λ≅657 nm. The uncertainty of the standard was evaluated by the use of two independent systems. After comparison of the optical frequency with the Cs atomic clock the frequency is determined to be 455 986 240 494.13 (12) kHz
Keywords :
atom-photon collisions; atomic clocks; calcium; frequency standards; laser cooling; laser frequency stability; optical variables measurement; quantum optics; radiation pressure; 657 nm; 3P1-1S0; 40Ca; Ca; Cs; Cs atomic clock; Physikalisch Technische Bundesanstalt; frequency; independent systems; intercombination transition; laser cooled ballistic atom; laser frequency stability; optical Ca frequency standard; optical frequency; optical wavelength/frequency standard; standard; uncertainty; Atom lasers; Atom optics; Atomic beams; Atomic measurements; Charge carrier processes; Frequency; Laser beams; Laser stability; Laser transitions; Resonance;
Conference_Titel :
Frequency and Time Forum, 1999 and the IEEE International Frequency Control Symposium, 1999., Proceedings of the 1999 Joint Meeting of the European
Conference_Location :
Besancon
Print_ISBN :
0-7803-5400-1
DOI :
10.1109/FREQ.1999.841401
