A Potassium Atom Four-Level Active Optical Clock Scheme

作者：Zhang Sheng-Nan; Wang Yan-Fei; Zhang Tong-Gang; Zhuang Wei^*; Chen Jing-Biao

来源：Chinese Physics Letters, 2013, 30(4): 040601.

DOI：10.1088/0256-307X/30/4/040601

• LASERS

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, rho(33) and rho(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 404.7nm pumping laser. According to the mechanism of the active optical clock, under the action of the 404.7nm pumping laser, the scheme can output a 1252.2nm quantum-limited-linewidth laser, which can be directly used as an active optical frequency standard.

• 出版日期2013-4
• 单位北京大学