双体布拉格光栅光谱反馈特性的理论研究  

Theoretical study on feedback characteristics of double volume Bragg gratings

作　　者：李志永[1,2] 谭荣清[1] 徐程[1,2] 李琳[1,2] 

机构地区：[1]中国科学院电子学研究所,高功率气体激光技术部,北京100190 [2]中国科学院大学,北京100049

出　　处：《强激光与粒子束》2013年第7期1643-1647,共5页High Power Laser and Particle Beams

摘　　要：基于Kogelnik理论模型,以平面波为入射光,分析了双体布拉格光栅(VBG)的反馈特性。理论分析表明,采用双VBG结构,通过控制两个VBG的中心波长差,可以使光栅反馈的效率提高,带宽加宽。对于由两块带宽100pm、衍射效率20%的VBG组成的双VBG反馈系统,中心波长相同时,衍射效率最大(33.3%);中心波长相差84pm时,其带宽为单VBG带宽的1.8倍(180pm)。由于VBG的中心波长存在温度漂移特性,因此通过改变双VBG结构中VBG的温度可以实现衍射效率和带宽的改变,为泵浦源的优化提供有效可行的方法。Assuming the incident light was a plane wave, the feedback characteristics of double volume Bragg gratings （VBGs） were studied based on Kogelnik＇s theory. According to the analysis, with the structure of the double VBGs, the band- width could be broadened and the diffraction efficiency could be improved through choosing the wavelength differences between the two VBGs. For a system consisting of two VBGs whose bandwidth and diffraction efficiency were 100 pm and 20% respectively, the diffraction efficiency was 33.3% when their central wavelengths had the same value, and the bandwidth could be tuned to 1.8 times （180 pm） of a single VBG＇s bandwidth. Since there was a thermal shift in VBG＇s central wavelength, changes in diffrac- tion efficiency and bandwidth could be realized by adjusting the VBGs＇ temperature. External cavities with double VBGs offers an efficient method for optimizing pumping source.

关 键 词：半导体激光器 线宽压窄 线宽可调 体布拉格光栅 双光栅 

分 类 号：TN248.4[电子电信—物理电子学]