摘要
一般激光器的阈值电流会随着腔长增加而增大,但是最近发现单量子阱激光器的阈值电流在很大的腔长范围内保持恒定。造成这样现象的原因是由于激光器有源区不掺杂和采用了线形渐变折射率导引机制的量子阱激光器结构,这样可以有效的减少载流子泄漏和非辐射复合,因此激光器内损耗很小,阈值增益主要由腔面损耗决定,致使阈值电流在很大的腔长范围内保持恒定。
It is used to know that the threshold current of laser increases with respect to the length of cavity.However,by undoping the active region and adopting linear graded index（GRIN） quantum well laser structure,it was found that the threshold current of single quantum well laser stays constant for a large range of the length of cavity.The leakage current and the nonradiative recombination are reduced due to the change of the setting;as a result,the internal loss is minimized.The threshold gain is mainly depending on cavity facet loss;therefore,the threshold current stays constant for a large range of the length of cavity.
出处
《固体电子学研究与进展》
CAS
CSCD
北大核心
2010年第2期165-168,共4页
Research & Progress of SSE
基金
国家973计划项目(2006CB604902)
国家863计划项目(SQ2007AA03Z431230)
北京市人才强教计划项目(05002015200504)
国家重点基础研究发展规划项目(2008ZX1001-014)
关键词
阈值电流
内损耗
阈值增益
threshold current
internal loss
threshold gain
