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. We present measurements of the N-resonance contrast, width and light shift for the D₁ line of ⁸⁷Rb with varying buffer gases, and find good agreement with an analytical model of this resonance. The results suggest that N resonances are promising for atomic clock applications.
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Zibrov et al. (2005) studied this question.
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