Raman–Ramsey Interaction for Coherent Population Trapping Cs Clock

Author

Guérandel, Stéphane ; Zanon, Thomas ; Castagna, Natascia ; Dahes, Fariza ; De Clercq, Emeric ; Dimarcq, Noël ; Clairon, André

Author_Institution

Lab. Nat. de Metrologie et d´´Essais-Syst. de References Temps Espace, Obs. de Paris

Volume

56

Issue

2

fYear

2007

fDate

4/1/2007 12:00:00 AM

Firstpage

383

Lastpage

387

Abstract

A gas cell atomic frequency standard based on coherent population trapping (CPT) with Ramsey interrogation pulses is developed. The clock resonance is detected in a Cs cell with buffer gas using two phase-locked diode lasers tuned to the Dl line. A preliminary short-term stability of 3.5 10^-12t is reported. The CPT specificity allows a new interrogation-detection sequence, i.e., the continuous pulse train, which, with phase modulation, could lead to better short-term stability compared to usual continuous CPT clocks. The parameters optimizing the stability include a high Rabi frequency, a very short measurement time, and an interrogation time equal to the lifetime of the hyperfine coherence

Keywords

atomic clocks; caesium; frequency stability; frequency standards; Cs clock; Raman-Ramsey interaction; atomic clock; buffer gas; cesium cell; coherent population trapping; frequency standard; Atom optics; Atomic clocks; Diode lasers; Frequency; Gas lasers; Laser excitation; Optical buffering; Optical polarization; Resonance; Stability; Atomic clock; Ramsey; buffer gas; c oherent population trapping (CPT); cesium cell; frequency standard;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/TIM.2007.891124

Filename

4126869