外腔反馈光对内腔中光子态密度的影响  

Effect of External Cavity′s Feedback Light on State Density of Photon in Internal Cavity

作　　者：胡险峰[1] 

机构地区：[1]四川大学物理科学与技术学院,四川成都610064

出　　处：《光学学报》2010年第9期2684-2689,共6页Acta Optica Sinica

摘　　要：研究了外腔反馈对内腔有效长度和内腔中光子态密度的影响,并对自混合干涉可能产生的作用进行了分析讨论。研究表明,外腔反馈光不仅改变法布里-珀罗腔前端面反射率,也会引起等效腔长不连续变化,导致腔内光子态密度不连续变化。因此,外腔反馈光使量子效率发生连续及不连续改变,导致介质增益系数和饱和光强也出现连续及不连续改变。而且强外腔反馈引起复合腔模式的变化不会使自混合干涉信号出现阶跃变化,同时外腔反馈光对载流子寿命影响很小,显著减小了载流子辐射复合寿命,提高辐射复合效率,削弱非辐射复合效率。Effects of external cavity′s feedback light on length of internal cavity and the photon state density in internal cavity are investigated,and effects of self mixing interference are discussed in detail. The results demostrate that,external cavity′s feedback light not only changes front facet reflectivity of Fabry-Perot cavity,but also cause discontinuous variation of equivalent length of internal cavity,and then photon state density in internal cavity also discontinuously varies. So that,the external feedback light makes quantum efficiency continuously and discontinuously vary. Also gain coefficient and saturated light intensity vary continuously and discontinuously. Also self-mixing interference signal does not change discontinuously with the complex cavity modes produced by external cavity′s feedback light,and effect of external cavity′s feedback light on charge carrier lifetime is very small. External cavity′s feedback light evidently reduces radiative recombination lifetime of charge carrier,raises radiative recombination efficiency and weakens non-radiative recombination efficiency.

关 键 词：光学测量 激光二极管 光子态密度 自混合干涉 量子效率 斜率效率 

分 类 号：TN248.4[电子电信—物理电子学]