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

fYear

2005

fDate

29-31 Aug. 2005

Firstpage

774

Lastpage

777

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Frequency Control Symposium and Exposition, 2005. Proceedings of the 2005 IEEE International

Conference_Location

Vancouver, BC

Print_ISBN

0-7803-9053-9

Type

conf

DOI

10.1109/FREQ.2005.1574032

Filename

1574032