红外与毫米波学报2023，Vol.42Issue(6)：796-806,11.DOI:10.11972/j.issn.1001-9014.2023.06.013
基于布拉格反射镜的单模太赫兹量子级联激光器
Single mode terahertz quantum cascade lasers based on distributed Bragg reflector
摘要
Abstract
In the conventional semiconductor distributed Bragg reflector(DBR)lasers,to obtain stable single mode emission,the gain section should be short enough to make the free spectrum range larger than half of the bandwidth of the reflection plateau caused by the DBR.This constraint severely limits the threshold and the output power of the la-sers.In this work,single mode terahertz DBR quantum cascade lasers(THz-DBR-QCLs)that break the above con-straint are realized.The lasers are based on the ridge waveguide,and exploit a cleaved facet and a DBR mirror to con-struct the resonator.Exploiting the intrinsic narrow gain spectrum of the THz-QCL,we tailor the reflection spectrum of the DBR so that the high reflection plateau and the gain spectrum are partially overlapped,obtaining the THz-QCLs with single mode emission.Such strategy enables single mode emission with a significantly elongated gain section,far beyond the constraint of the free spectrum range.In experiments,we realize the single mode THz-DBR-QCLs,whose gain section is as long as 3.6 mm.The emission frequency is about 2.7 THz,and the side mode suppression ratio(SMSR)exceeds 25 dB.The measured threshold and temperature characteristics of the THz-DBR-QCLs are compara-ble to the Fabry-Perot THz-QCLs fabricated with the same material.Our work suggests a novel approach to realize the high performance single mode THz-QCLs.关键词
半导体激光器/量子级联/太赫兹/分布式布拉格反射镜/单模/光子禁带Key words
semiconductor lasers/quantum cascade/terahertz/distributed Bragg reflector/single mode/photonic band gap分类
信息技术与安全科学引用本文复制引用
白弘宙,臧善志,谭诚,王凯,甘良华,徐刚毅..基于布拉格反射镜的单模太赫兹量子级联激光器[J].红外与毫米波学报,2023,42(6):796-806,11.基金项目
国家自然科学基金(61974151,67134006,61574149) （61974151,67134006,61574149）
上海市科委项目(20ZR1466200) Supported by the National Natural Science Foundation of China(61974151,67134006,61574149) （20ZR1466200）
the Shanghai Committee of Science and Technology(20ZR1466200) （20ZR1466200）
