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借助光子晶体中二能级原子的自发辐射理论证明缺陷态的局域场存在的必然性以及局域场基本性质,为研究光子晶体光纤掺杂自发辐射的内在规律提供了理论依据。且将自发辐射理论与数值模拟相结合,在缺陷介质中掺激活杂质时,研究了光子晶体光纤的掺杂局域场特征以及受激辐射增强和透射率大于1现象与光子带隙群速度异常和掺杂层复有效折射率成负的虚部之间的内在关系。由此说明光子晶体光纤的缺陷介质中掺入激活杂质时,光子禁带中能出现品质因子非常高的杂质态,具有很大的态密度,较强的受激辐射放大。
The necessity of the local field in the defect state and the basic properties of the local field are proved by the spontaneous emission theory of two-level atoms in the photonic crystal, which provides a theoretical basis for the study of the inherent law of spontaneous emission of photonic crystal fiber. In addition, combining the spontaneous emission theory and numerical simulation, we study the local field characteristics of doped photonic crystal fiber and the enhancement of stimulated emission and the phenomenon that the transmissivity is greater than 1 and the group velocity of photonic band gap group And the doping layer complex effective refractive index into a negative imaginary part of the relationship between. This shows that the photonic crystal fiber defect medium incorporates activation impurities, the photon band gap can appear very high quality factor impurity state, with a large density of states, strong stimulated emission amplification.