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Constructive polarization modulation for coherent population trapping clock

2014; American Institute of Physics; Volume: 105; Issue: 23 Linguagem: Inglês

10.1063/1.4903862

1520-8842

Peter Yun, Jean-Marie Danet, David Holleville, Emeric de Clercq, Stéphane Guérandel,

Advanced MRI Techniques and Applications

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.