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Enhanced gain and narrow linewidth of an optical cavity by the Doppler effect in a four-level atomic system |
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| Authors: | Yandong Peng Aihong Yang Huiyun Zhang Peng Li Lin Jiang Luyin Zhang |
| Affiliation: | 1. Shandong University of Science and Technology , Qingdao Key Laboratory of Terahertz Technology, Department of Physics, School of Science , Qingdao , Shandong , 266590 , China pengyd@siom.ac.cn;3. Shandong University of Science and Technology , Qingdao Key Laboratory of Terahertz Technology, Department of Physics, School of Science , Qingdao , Shandong , 266590 , China |
| Abstract: | Abstract A scheme for high gain and narrow linewidth of an optical cavity with a four-level atomic system is proposed by the Doppler effect via active Raman gain (ARG) process. Atomic motion leads to Doppler frequency shift which induces constructive interference for the linear susceptibility. The enhanced normal dispersion greatly narrows the cavity linewidth, and the amplified gain gives rise to a high cavity transmission. Simulation results show that the cavity linewidth based on ARG is about one order of magnitude narrower than that based on electromagnetically-induced transparency under the same conditions, and the cavity transmission intensity could be enhanced by nearly 30 times. |
| Keywords: | atomic coherence quantum interference active Raman gain Doppler effect dispersion gain |