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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
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ZHANG Sheng-Nan, WANG Yan-Fei, ZHANG Tong-Gang et al 2013 Chin. Phys. Lett. 30 040601 |
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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, ρ33 and ρ55 are equal to 8.3% and 3.5%, respectively, and the population inversion between the 5S1/2 and 4P3/2 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.
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Received: 18 December 2012
Published: 28 April 2013
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