| The probe gain with and without inversion in a four—level atomic model：light amplification at a short wavelength |
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| 引用本文： | 吴金辉,王登攀,张惠芳,肖志宏,高锦岳. The probe gain with and without inversion in a four—level atomic model：light amplification at a short wavelength[J]. 中国物理, 2003, 12(1): 39-44. DOI: 10.1088/1009-1963/12/1/307 |
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| 作者姓名： | 吴金辉 王登攀 张惠芳 肖志宏 高锦岳 |
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| 作者单位： | College of Physics, Jilin University, Changchun 130023, China |
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| 基金项目： | Project supported in part by the National Natural Science Foundation of China (Grant No 60078015), and the Doctoral Program Foundation of Institution of Higher Education of China (Grant No 19201038) |
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| 摘 要： | We propose a new four-level atomic model for achieving lightamplification at a short wavelength, where direct incoherentpumping into the top level is avoided by the advantage ofcoherent pumping. In this model, the lower level of the probetransition is an excited state but not the usual ground state.By analytical as well as numerical calculations, we find that theprobe gain, either with or without population inversion, which dependson the relation between spontaneous decay rates $g_{42}$ and $g_{21}$, can be achieved with proper parameters. We note that the Raman scatteringgain always plays an important role in achieving the probe amplification.
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| 关 键 词： | 激光器 短波长光放大 四能级原子 无反转 |
| 收稿时间： | 2002-07-17 |
The probe gain with and without inversion in a four-level atomic model: light amplification at a short wavelength |
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| Wu Jin-Hui,Wang Deng-Pan,Zhang Hui-Fang,Xiao Zhi-Hong and Gao Jin-Yue. The probe gain with and without inversion in a four-level atomic model: light amplification at a short wavelength[J]. Chinese Physics, 2003, 12(1): 39-44. DOI: 10.1088/1009-1963/12/1/307 |
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| Authors: | Wu Jin-Hui Wang Deng-Pan Zhang Hui-Fang Xiao Zhi-Hong Gao Jin-Yue |
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| Affiliation: | College of Physics, Jilin University, Changchun 130023, China; Chinese Center of Advanced Science and Technology (World Laboratory), Beijing 100080, China |
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| Abstract: | We propose a new four-level atomic model for achieving lightamplification at a short wavelength, where direct incoherentpumping into the top level is avoided by the advantage ofcoherent pumping. In this model, the lower level of the probetransition is an excited state but not the usual ground state.By analytical as well as numerical calculations, we find that theprobe gain, either with or without population inversion, which dependson the relation between spontaneous decay rates $g_{42}$ and $g_{21}$, can be achieved with proper parameters. We note that the Raman scatteringgain always plays an important role in achieving the probe amplification. |
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| Keywords: | probe gain with or without inversion atomic coherence Ramanscattering gain |
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