摘要
设计了一种新颖的快速可调谐激光器。这种激光器在恒定电流泵浦的有源微环组成的半导体环形激光器腔外部集成一个可调谐的无源微环反射器,其结构将决定激光器激射腔模的有源腔和无源可调谐部分分离,有助于提高调谐速度。与光栅结构的激光器相比,该激光器结构简单,具有强烈的选模功能,不需要相位匹配部分,输出波长不受调谐部分热效应的影响。基于多模速率方程建立了激光器的理论和数值模型,数值仿真结果表明该激光器能在选取的15个腔模范围内完成数字调谐,且具有的较低阈值电流和适中的边模抑制比。
A novel and rapidly tunable laser was proposed, consisting of a semiconductor ring laser （SRL） formed by an active microring under constant current pumping and a monolithically integrated external tunable passive microring reflector. The geometry, therefore, enables very fast tuning by separating the mechanism （the active microring cavity） that defines stable lasing mode frequencies from the tuning mechanism （the passive microring） that only selects one of these stable frequencies. Furthermore, compared to the laser based on grat- ing structures, this SRL offers many promising advantages including strong mode-selection and simple fabrica- tion, which does not require phase matching sections and provides a strong immunity of the output wavelength to the thermal fluctuations of the tunable section. Theoretical simulations based on a multimode rate-equation model were used to study the performance of the laser. Numerical simulations demonstrate digital tuning of the laser across 15 cavity modes with reasonably low threshold current of about 40 mA and moderate side-mode sup- pression ratio （SMSR）.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2012年第2期315-320,共6页
High Power Laser and Particle Beams
基金
Supported by the Research Foundation of Education Department of Zhejiang Province,China(Y200803996)
