Enhanced spontaneous emission factor for microcavity lasers  

作　　者：张晓霞 潘炜 

机构地区：[1]School of Optic-Electronic Information,University of Electronic Science and Technology of China [2]School of Information Science and Technology,Southwest Jiaotong University

出　　处：《Chinese Optics Letters》2008年第6期411-414,共4页中国光学快报（英文版）

基　　金：the National Natural Science Foundation of China(No.90201011 and 10174057);the Key Project of Chinese Ministry of Education(No.2005-105148);the Specialized Research Fund for the Doctoral Program of Higher Education of China(No.20070613058)

摘　　要：The microcavity and the influence of nonradiative recombination can control spontaneous emission. An analytic resolution of rate equation is studied for microcavity lasers. The relationship between output properties and structural parameters of multi-quantum wells （MQWs） is obtained. One of the most important consequences of the increased spontaneous emission factor is the reduction of laser threshold. It is found that the characteristic curve of a ＂thresholdless＂ laser is strongly nonradiative depopulation-dependent. The light output is increased by the enhanced well number and the reduced width. In particular, there is an optimal well number corresponding to the lowest threshold current density for MQW structure in the microcavity lasers.The microcavity and the influence of nonradiative recombination can control spontaneous emission. An analytic resolution of rate equation is studied for microcavity lasers. The relationship between output properties and structural parameters of multi-quantum wells （MQWs） is obtained. One of the most important consequences of the increased spontaneous emission factor is the reduction of laser threshold. It is found that the characteristic curve of a ＂thresholdless＂ laser is strongly nonradiative depopulation-dependent. The light output is increased by the enhanced well number and the reduced width. In particular, there is an optimal well number corresponding to the lowest threshold current density for MQW structure in the microcavity lasers.

关 键 词：MICROCAVITIES Semiconductor quantum wells Spontaneous emission Threshold current density 

分 类 号：O431.2[机械工程—光学工程] TN241[理学—光学]