Title :
Recent results on a pulsed CPT clock
Author :
Zanon, T. ; Trémine, S. ; Guérandel, S. ; Dahès, F. ; de Clercq, E. ; Clairon, A. ; Dimarcq, N.
Author_Institution :
LNE-SYRTE-CNRS, Obs. de Paris
Abstract :
CPT clocks are very attractive for their miniaturization potentiality. Nevertheless, two main effects limit today their performance: the optical pumping associated with circularly polarized lasers and the line broadening due to saturation effects. We propose to overcome these limitations by the use of orthogonal linear laser polarizations and a pulsed interrogation sequence. The optimization of the time sequence leading to the best characteristics (contrast, linewidth) of the dark resonance is discussed. Very preliminary measurements of the frequency stability demonstrate an interesting performance of 3.5 10-12 tau-frac12
Keywords :
atomic clocks; frequency stability; laser beam effects; optical pumping; radiation pressure; resonant states; spectral line broadening; circularly polarized lasers; coherent population trapping; dark resonance; line broadening; optical pumping; orthogonal linear laser polarizations; pulsed CPT clock; pulsed interrogation sequence; time sequence; Atomic measurements; Clocks; Frequency; Laser beams; Masers; Optical polarization; Optical pulses; Optical pumping; Pump lasers; Resonance;
Conference_Titel :
Frequency Control Symposium and Exposition, 2005. Proceedings of the 2005 IEEE International
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-9053-9
DOI :
10.1109/FREQ.2005.1574032
