Title :
The calcium optical frequency standard: present status
Author :
Riehle, F. ; Ishikawa, J. ; Kisters, T. ; Witte, A. ; Helmcke, J.
Author_Institution :
Phys.-Tech. Bundesanstalt, Braunschweig, Germany
Abstract :
An optical frequency standard based on a dye laser stabilized to the Lamb dip of the Doppler-broadened Ca intercombination line is reported. The measured depth of the Lamb dip depends strongly on the laser power and the excitation geometry and can be explained quantitatively by calculation of the transition probability. The stabilized laser frequency can be made reproducible to better than 300 Hz by stabilizing the same laser to two independent thermal atomic beams with the possibility of laser cooling one of the atomic beams.<>
Keywords :
Doppler effect; Lamb shift; atomic beams; calcium; frequency measurement; laser beam applications; laser frequency stability; measurement standards; radiation pressure (atoms); Ca; Doppler-broadened Ca intercombination line; Lamb dip; dye laser; excitation geometry; laser frequency stability; optical frequency standard; stabilized laser frequency; thermal atomic beams; transition probability; Atom lasers; Atomic beams; Calcium; Frequency; Geometrical optics; Laser excitation; Laser stability; Laser transitions; Power lasers; Power measurement;
Conference_Titel :
Precision Electromagnetic Measurements, 1990. CPEM '90 Digest., Conference on
Conference_Location :
Ottawa, Ontario, Canada
DOI :
10.1109/CPEM.1990.109935
