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Frontiers in Optics

Novel absorption resonance for all-optical atomic clocks

Irina V. Novikova, Sergei A. Zibrov, Yanhong Xiao, D. F. Phillips, Ronald Lee Walsworth, Alexander S. Zibrov, А. В. Тайченачев, Valeriy I. Yudin

Published Jan 1, 2005• 0 citations
Publisher

Abstract

We report an experimental study of an all-optical three-photon-absorption resonance (N -resonance) and discuss its potential application as an alternative to atomic clocks based on coherent population trapping (CPT).
DOI
10.1364/fio.2005.jtuc58

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Applied Physics Letters•Dec 8, 2014•33 citations
We report an experimental study of an all-optical three-photon-absorption resonance (known as an "N-resonance") and discuss its potential application as an alternative to atomic clocks based on coherent population trapping (CPT). We present measurements of the N-resonance contrast, width and light shift for /sup 87/Rb under various conditions including both D/sub 1/ and D/sub 2/ optical transitions. Under conditions such that first-order light shifts cancel, we observe promising short-term frequency stability (/spl sim/ 1.5 /spl times/ 10/sup -11/ /spl tau//sub - 1/2 /) for an N-resonance on the Di transition of /sup 87/ Rb vapor.
We report an experimental study of an all-optical three-photon-absorption resonance (known as an ``NNN resonance'') and discuss its potential application as an alternative to atomic clocks based on coherent population trapping. We present measurements of the NNN-resonance contrast, width and light shift for the D1{D}_{1}D1​ line of 87Rb^{87}\mathrm{Rb}87Rb with varying buffer gases, and find good agreement with an analytical model of this resonance. The results suggest that NNN resonances are promising for atomic clock 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.