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Journal of Time and Frequency

Technology of Atomic Clocks Based on Coherent Population Trapping and Its Progress

Shougang Zhang

Published Jan 1, 2007• 0 citations
OpenAlex

Abstract

The principle of coherent population trapping(CPT) is analyzed.The principle and composition for the two types of atomic clocks,which are realized based on CPT,are introduced and the characteristics are analyzed for each one.The research progress of them with bright prospects is also reviewed.

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The coherent population trapping phenomenon (CPT) has created interesting avenues in the practical realization of atomic frequency standards using laser optical pumping. In practice two different types of standards can be implemented: a passive clock based on the dark state created in the ensemble by the CPT phenomenon and a maser based on the ground state oscillating magnetization induced by the same phenomenon. The paper describes the basic physics involved in the approach and summarizes the progress made thus far in the practical implementation of such frequency standards.