外腔二极管激光谱合束光源模式稳定性  

Mode Stability of Spectral-Beam-Combined Diode Laser Source Based on External Cavity

作　　者：蔡伟 杨承爽 庄英豪 张青松 吴真 晏青青 张彬[2] Cai Wei;Yang Chengshuang;Zhuang Yinghao;Zhang Qingsong;Wu Zhen;Yan Qingqing;Zhang Bin(School of Science,Xihua University,Chengdu610039,Sichuan,China;College of Electronics and Information Engineering,Sichuan University,Chengdu610064,Sichuan,China)

机构地区：[1]西华大学理学院,四川成都610039 [2]四川大学电子信息学院,四川成都610064

出　　处：《应用激光》2024年第4期205-211,共7页Applied Laser

基　　金：国家自然科学基金(61905203);四川省科技厅中央引导地方项目基金(2021ZYD0036);中国科学院自适应光学重点实验室(LAOF1801)。

摘　　要：为研究外腔二极管激光阵列谱合束系统的模式特性,基于光反馈二极管激光速率方程,建立二极管激光子单元的耦合腔谐振模型,给出能在耦合腔中稳定起振的模式条件,并将振荡模式分为单模式振荡(仅一个模式能在耦合腔中稳定起振)和多模式振荡(多个模式能在耦合腔中起振)。结合耦合腔增益曲线,给出了单模式振荡和多模式振荡时的模式结构和光束特性,分析了谱合束系统结构参数对模式稳定性的影响。结果表明,增大激光器前端面反射率、降低外腔等效反射率,可以提高谱合束光源的模式稳定性。针对子单元数越多的二极管激光阵列,从物理机制角度分析发现采用焦距越短的变换透镜可以使边缘子单元模式更加稳定。In order to study the mode characteristics of the external cavity diode laser array spectral-beam-combined system,based on rate equation of the optical feedback diode laser,the coupled cavity oscillating model of the diode laser emitter is established,and the condition of modes that can stably oscillate in the coupled cavity are given,and the oscillation modes that satisfy the phase condition are divided into single mode oscillation(only one mode can stably oscillate in the coupled cavity)and multimode oscillation(multiple modes can stably oscillate in the coupled cavity).Combined with the gain curve of the coupled cavity,the mode structures and beam properties of single mode oscillation and multi-mode oscillation are given,and the effects of the structural parameters of the spectral beam combining system on the mode stability are analyzed.The results show that enhancing the reflectivity of the laser′s front surface and reducing the external cavity′s equivalent reflectivity can enhance the spectral combining light source′s modal stability.For arrays with a larger number of diode laser emitters,we reveal from a physical mechanism perspective that utilizing a transform lens with a shorter focal length can stabilize the modes of edge emitters.

关 键 词：模式稳定性 二极管激光器阵列 谱合束 速率方程 

分 类 号：TN248.4[电子电信—物理电子学]