Journal
APPLIED PHYSICS LETTERS
Volume 105, Issue 23, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4903862
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Funding
- Facilities for Innovation, Research, Services, Training in Time and Frequency (FIRST-TF)
- ANR
- DGA (ISIMAC) [ANR-11-ASTR-0004]
- EMRP program [IND55 Mclocks]
- EMRP within EURAMET
- European Union
- Agence Nationale de la Recherche (ANR) [ANR-11-ASTR-0004] Funding Source: Agence Nationale de la Recherche (ANR)
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We propose a constructive polarization modulation scheme for atomic clocks based on coherent population trapping (CPT). In this scheme, the polarization of a bichromatic laser beam is modulated between two opposite circular polarizations to avoid trapping the atomic populations in the extreme Zeeman sublevels. We show that if an appropriate phase modulation between the two optical components of the bichromatic laser is applied synchronously, the two CPT dark states which are produced successively by the alternate polarizations add constructively. Measured CPT resonance contrasts up to 20% in one-pulse CPT and 12% in two-pulse Ramsey-CPT experiments are reported, demonstrating the potential of this scheme for applications to high performance atomic clocks. (C) 2014 AIP Publishing LLC.
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