Title :
Frequency Stability Measurement of a Raman-Ramsey Cs Clock
Author :
Castagna, N. ; Guérandel, S. ; Dahès, F. ; Zanon, T. ; de Clercq, E. ; Clairon, A. ; Dimarcq, N.
Author_Institution :
LNE-SYRTE, Paris
fDate :
May 29 2007-June 1 2007
Abstract :
CPT clocks are studied worldwide as miniature frequency standards for portable applications. To improve their frequency stability, we have investigated the optimum operating conditions (cell temperature, laser intensity, interrogation method) and measured the corresponding frequency shifts and stability. Compared to the continuous CPT interrogation, the pulsed interrogation reduces the light shift by a factor 300 and improves the frequency stability by a factor 10. The short term frequency stability is 9 x 10 -3 at 1 s, limited to 2 x 10 -3 after 300 s.
Keywords :
atom-photon collisions; atomic clocks; caesium; laser frequency stability; radiation pressure; CPT clock; Cs; Raman-Ramsey caesium clock; Ramsey interrogation method; cell temperature; coherent population trapping phenomenon; diode lasers; frequency shift measurement; frequency stability measurement; laser beam intensity; optimum operating conditions; Atomic beams; Clocks; Frequency measurement; Laser beams; Laser excitation; Laser stability; Laser tuning; Masers; Stationary state; Temperature;
Conference_Titel :
Frequency Control Symposium, 2007 Joint with the 21st European Frequency and Time Forum. IEEE International
Conference_Location :
Geneva
Print_ISBN :
978-1-4244-0646-3
Electronic_ISBN :
1075-6787
DOI :
10.1109/FREQ.2007.4319033
