A broadband external cavity tunable InAs/GaAs quantum dot laser by utilizing only the ground state emission  

作　　者：吕雪芹 金鹏 王占国 

机构地区：[1]Key Laboratory of Semiconductor Materials Science,Institute of Semiconductors,Chinese Academy of Sciences

出　　处：《Chinese Physics B》2010年第1期534-537,共4页中国物理B（英文版）

基　　金：Project supported by the National Basic Research Program of China (Grant No. 2006CB604904);the National Natural Science Foundation of China (Grant Nos. 60976057, 60876086 and 60776037)

摘　　要：A broadband external cavity tunable laser is realized by using a broad-emitting spectral InAs/GaAs quantum dot （QD） gain device. A tuning range of 69 nm with a central wavelength of 1056 nm, is achieved at a bias of 1.25 kA/cm^2only by utilizing the light emission from the ground state of QDs. This large tunable range only covers the QD ground-state emission and is related to the inhomogeneous size distribution of QDs. No excited state contributes to the tuning bandwidth. The application of the QD gain device to the external cavity tunable laser shows its immense potential in broadening the tuning bandwidth. By the external cavity feedback, the threshold current densitycan be reduced remarkably compared with the free-running QD gain device.A broadband external cavity tunable laser is realized by using a broad-emitting spectral InAs/GaAs quantum dot （QD） gain device. A tuning range of 69 nm with a central wavelength of 1056 nm, is achieved at a bias of 1.25 kA/cm^2only by utilizing the light emission from the ground state of QDs. This large tunable range only covers the QD ground-state emission and is related to the inhomogeneous size distribution of QDs. No excited state contributes to the tuning bandwidth. The application of the QD gain device to the external cavity tunable laser shows its immense potential in broadening the tuning bandwidth. By the external cavity feedback, the threshold current densitycan be reduced remarkably compared with the free-running QD gain device.

关 键 词：QUANTUM-DOT tunable laser external cavity broadband tuning 

分 类 号：TN248.4[电子电信—物理电子学]