中国物理B ›› 2003, Vol. 12 ›› Issue (1): 39-44.doi: 10.1088/1009-1963/12/1/307
吴金辉, 王登攀, 张惠芳, 肖志宏, 高锦岳
Wu Jin-Hui (吴金辉)a, Wang Deng-Pan (王登攀)a, Zhang Hui-Fang (张惠芳)a, Xiao Zhi-Hong (肖志宏)a, Gao Jin-Yue (高锦岳)ab
摘要: We propose a new four-level atomic model for achieving light amplification at a short wavelength, where direct incoherent pumping into the top level is avoided by the advantage of coherent pumping. In this model, the lower level of the probe transition is an excited state but not the usual ground state. By analytical as well as numerical calculations, we find that the probe gain, either with or without population inversion, which depends on the relation between spontaneous decay rates $\g_{42}$ and $\g_{21}$, can be achieved with proper parameters. We note that the Raman scattering gain always plays an important role in achieving the probe amplification.
中图分类号: (Level crossing and optical pumping)