A Potassium Atom Four-Level Active Optical Clock Scheme
ZHANG Sheng-Nan, WANG Yan-Fei, ZHANG Tong-Gang, ZHUANG Wei** , CHEN Jing-Biao
Institute of Quantum Electronics and State Key Laboratory of Advanced Optical Communication and System Network, School of Electronics Engineering and Computer Science, Peking University, Beijing 100871
Abstract ：We present an active optical clock scheme with a four-level quantum potassium system. We calculate the population probabilities of each state using the density matrix. At the steady state, ρ 33 and ρ 55 are equal to 8.3% and 3.5%, respectively, and the population inversion between the 5S 1/2 and 4P 3/2 states is built up in the thermal potassium cell with a 404.7 nm pumping laser. According to the mechanism of the active optical clock, under the action of the 404.7 nm pumping laser, the scheme can output a 1252.2 nm quantum-limited-linewidth laser, which can be directly used as an active optical frequency standard.
收稿日期: 2012-12-18
出版日期: 2013-04-28
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