Title :
Analysis of the light shift effect in the 87Rb frequency standard
Author :
Levi, Filippo ; Novero, Carlo ; Godone, Aldo ; Brida, Giorgio
Author_Institution :
Ist. Elettrotecnico Nazionale Galileo Ferraris, Torino, Italy
fDate :
4/1/1997 12:00:00 AM
Abstract :
The 87Rb cell frequency standard, optically pumped by a laser diode, is of great interest in the development of high-stability, short-term oscillators. We report the experiments performed on a rubidium-cell prototype aiming to evaluate the transfer of the laser and microwave noise to the hyperfine clock transition via the light-shift effect, which appears to be the main contribution to the observed short- and medium-term instabilities in this kind of a standard. Pulsed optical pumping is also examined in order to strongly reduce the light-shift effect: the experimental results show an improvement in medium term frequency stability
Keywords :
atomic beams; frequency measurement; frequency stability; laser beam applications; laser noise; measurement standards; microwave measurement; optical pumping; rubidium; 87Rb frequency standard; Ramsey interaction; Rb; high-stability; hyperfine clock transition; laser and microwave noise; laser diode; light shift effect; light-shift effect; medium term frequency stability; medium-term instabilities; microwave nois; pulsed optical pumping; rubidium-cell prototype; short-term instabilities; short-term oscillators; Diode lasers; Frequency; Laser excitation; Laser noise; Microwave oscillators; Optical noise; Optical pumping; Performance evaluation; Prototypes; Standards development;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
