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本文以简化的多能级理论模型为出发点,讨论了具有均匀加宽介质的单模CO_2激光器的稳态特性,线性稳定性和小信号腔长调制响应,泵浦调制响应,增益或损耗调制响应,并将其结果与由简单的二能级理论所得的结果进行比较,着重分析了非激光振转能级对上述三种调制响应的影响. 相似文献
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In this paper, the probe absorption spectrum of an atom in a double-band photonic crystal have been studied. In the modes, we assume that one of the two atomic transitions in a Λ-type atomic system is interacting with free vacuum modes, and another transition is interacting with free vacuum modes, isotropic photonic band gap (PBG) modes and anisotropic PBG modes, separately. The effects of the fine structure of the atomic lower levels on the probe absorption spectrum are investigated in detail in the three cases. The most interesting thing is that the two (four) transparencies at one (two) probe absorption peak(s), caused by the fine structure of the lower levels of an atom, are predicted in the case of isotropic PBG modes. 相似文献