638 nm光栅外腔窄线宽半导体激光器  

638 nm narrow linewidth diode laser with a grating external cavity

作　　者：刘野 刘宇 肖辉东 李洪玲 曲大鹏 郑权 LIU Ye;LIU Yu;XIAO Hui-dong;LI Hong-ling;QU Da-peng;ZHENG Quan(Changchun New Industries Optoelectronics Technology Co.,Ltd,Changchun 130012,China;Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China)

机构地区：[1]长春新产业光电技术有限公司,吉林长春130021 [2]中国科学院长春光学精密机械与物理研究所,吉林长春130033

出　　处：《中国光学》2020年第6期1249-1256,共8页Chinese Optics

基　　金：吉林省科技发展计划项目(No.20200401072GX)。

摘　　要：本文采用反射式全息光栅作为外部反馈元件,设计了638 nm光栅外腔窄线宽激光器。使用高分辨率的光谱分析仪检测了Littrow结构的外腔半导体激光器的输出光谱,并进一步研究了该激光器的阈值和波长调谐特性。实验采用了2400 l/mm和1800 l/mm两种刻线密度的反射式全息光栅进行研究,在120 mA的注入电流下,采用刻线密度为2400 l/mm的光栅外腔激光器的输出功率是45.2 mW,将阈值电流由60 mA降至51 mA,下降幅度为11%;采用刻线密度为1800 l/mm的光栅外腔激光器的输出功率是38.7 mW,将阈值电流由60 mA降至47 mA,下降幅度为24%,光谱线宽均压窄至3.5 pm,且分别了实现了9.4 nm和10.5 nm宽度的波长调谐。实验结果表明,采用反射式全息光栅的Littrow结构用于半导体激光器,极大地改善了半导体激光器的性能。In this paper,a narrow linewidth laser with an external grating cavity of 638 nm is described,wherein a reflection holographic grating was used as its external feedback element.The spectrum of the diode lasers with the grating external cavity arranged in a Littrow configuration were measured using a highresolution monochromator and the characteristics of the threshold and tuning properties were investigated.In the experiment,reflection holographic gratings with 2400 l/mm and 1800 l/mm groove density were studied.At 120 mA injection current,the output power of the external cavity laser was 45.2 mW when the groove density was 2400 l/mm,and the threshold current of the LD was reduced from 60 mA to 51 mA and the descent rate was 11%.When the groove density was 1800 l/mm,the output power was 38.7 mW,the threshold current of the LD was reduced from 60 mA to 47 mA,and the descent rate was 24%.Furthermore,the linewidths were suppressed to within 3.5 pm,and the tuning ranges were 9.4 nm and 10.5 nm in wavelength.The experimental results showed that the performance of semiconductor lasers was improved greatly using the Littrow configuration with a reflective holographic grating.

关 键 词：半导体激光器 全息光栅 Littrow结构 光谱线宽 

分 类 号：TN248.4[电子电信—物理电子学]