Emission characteristics of surface second-order metal grating distributed feedback semiconductor lasers  

作　　者：SHI JunXiu QIN Li LIU Yun ZHANG Nan ZHANG Jian ZHANG LiSen JIA Peng NING YongQiang ZENG YuGang ZHANG JinLong WANG LiJun 

机构地区：[1]Key Laboratory of Excited State Processes,Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China [2]Graduate University of the Chinese Academy of Sciences Beijing 100049,China

出　　处：《Chinese Science Bulletin》2012年第17期2083-2086,共4页

基　　金：supported by the National Natural Science Foundation of China (90923037,61106068 and 61176045)

摘　　要：To obtain high-power semiconductor lasers with stable operation in a single longitudinal mode and improve the characteristics of the output beam,an end-emitting surface second-order metal grating distributed feedback(DFB) laser emitting at around 940 nm is fabricated.The characteristics of the uncoated devices with and without gratings are tested under room temperature continuous-wave conditions without any temperature-control device and compared.The devices with gratings achieve high powers of up to 385 mW/facet and a small lateral far-field angle of 2.7° at 1.5 A,have only 4.13 nm/A wavelength-shift,and 0.09 nm spectral linewidth at 600 mA,and operate in a stable longitudinal mode.Devices without gratings operate in multimode,with a larger lateral far-field angle(7.3°) and spectral linewidth(1.3 nm),although with higher output powers.Because of the integration of second-order metal gratings and their very high coupling capability,the output beam quality is improved greatly,the lasing wavelength is stable and varies slowly with changes in injection current,while the spectrum is narrowed dramatically,and the far-field angles are greatly reduced.This opens the way for the realization of watt-scale power broad-stripe(>100 μm) surface second-order metal grating end and surface-emitting DFB lasers and arrays with single frequency,single mode operation and high output beam quality.To obtain high-power semiconductor lasers with stable operation in a single longitudinal mode and improve the characteristics of the output beam, an end-emitting surface second-order metal grating distributed feedback （DFB） laser emitting at around 940 nm is fabricated. The characteristics of the uncoated devices with and without gratings are tested under room temperature continu- ous-wave conditions without any temperature-control device and compared. The devices with gratings achieve high powers of up to 385 roW/facet and a small lateral far-field angle of 2.7~ at 1.5 A, have only 4.13 nm/A wavelength-shift, and 0.09 nm spectral linewidth at 600 mA, and operate in a stable longitudinal mode. Devices without gratings operate in multimode, with a larger lateral far-field angle （7.3°） and spectral linewidth （1.3 nm）, although with higher output powers. Because of the integration of second-order metal gratings and their very high coupling capability, the output beam quality is improved greatly, the lasing wavelength is stable and varies slowly with changes in injection current, angles are greatly reduced. This opens the way for the realization order metal grating end and surface-emitting DFB lasers and arrays beam quality. while the spectrum is narrowed dramatically, and the far-field of watt-scale power broad-stripe （〉100 μm） surface second- with single frequency, single mode operation and high output

关 键 词：高功率半导体激光器 金属光栅 分布反馈 二阶 表面 排放特性 DFB激光器 稳定运行 

分 类 号：TN248.4[电子电信—物理电子学] O436.1[机械工程—光学工程]