Magnetic-field-insensitive coherent-population-trapping resonances excited by bichromatic linearly polarized fields on the $D_1$ line of $^{133}$Cs

• URL: http://arxiv.org/abs/2110.02466v1
• Date: Wed, 6 Oct 2021 02:41:50 GMT
• Title: Magnetic-field-insensitive coherent-population-trapping resonances excited by bichromatic linearly polarized fields on the $D_1$ line of $^{133}$Cs
• Authors: K. Matsumoto, S. Kagami, A. Kirihara, S. Yanagimachi, T. Ikegami and A. Morinaga
• Abstract summary: We have experimentally demonstrated that magnetic-field-insensitive coherent-population-trapping (CPT) resonances are generated between the ground hyperfine levels. The frequency shift of the CPT resonance is 0.04 Hz for the deviation of 1 $mu$T at a "magic" magnetic field of 139 $mu$T.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We have experimentally demonstrated that magnetic-field-insensitive coherent-population-trapping (CPT) resonances are generated between the ground hyperfine levels on the $D_1$ line of $^{133}$Cs using a two-photon $\Lambda$ scheme excited by lin || lin polarizations. The frequency shift of the CPT resonance is 0.04 Hz for the deviation of 1 $\mu$T at a "magic" magnetic field of 139 $\mu$T and is 50 times smaller than that of the conventional clock transition at a typical bias magnetic field for the clock operation. The amplitude of the CPT spectrum excited by lin || lin polarizations is enhanced as the excitation intensity increases and is well explained by the three-level model without trap levels. Thus, the CPT resonance on the $D_1$ line of $^{133}$Cs atom excited by a simple lin || lin scheme will be one of the best candidates for frequency reference of miniature atomic clocks.

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