微透镜阵在光纤激光外腔谱组束中的应用研究  

Application of microlens array in external cavity-based spectral beam combining of fiber lasers

作　　者：吴卓亮[1] 赵尚弘[1] 楚兴春[1] 张迪[1] 占生宝[1] 张茜[1] 

机构地区：[1]空军工程大学电讯工程学院,陕西西安710077

出　　处：《光电子．激光》2011年第6期831-834,840,共5页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金资助项目(60678018)

摘　　要：提出了基于微透镜阵的光纤激光外腔谱组束方案,设计了能够对光纤阵列出射光束进行预准直的球面折射微透镜阵列。分析了组束系统的组束潜力,结果表明,所设计的组束系统能够实现12个Er3+/Yb3+共掺光纤激光器阵元的外腔谱组束。利用瑞利-索莫菲衍射积分理论,分析了微透镜对光纤出射光束的准直效果,结果表明,微透镜的实际焦距与设计参数有一定差别,准直后光束发散角仅为准直前光束发散角的2.7%,与无微透镜的组束系统相比,到达傅里叶变换透镜的光束光斑半径减小了2个数量级。A scheme using microlens array for external cavity-based spectral beam combining of fiber lasers is proposed,and a spherical-profile refractive microlens array that can preliminarily collimate the output beams from the fiber array is designed.The combination potential of the beam combining system is analyzed,which shows that twelve Er3＋/Yb3＋ codoped fiber lasers can be combined.Using Rayleigh-Sommerfeld diffraction integral theory,the collimating effect of the microlens array is analyzed,and the results show that the divergence angle after collimation is 2.7% of the original one though the actual focal length is slightly different from the designed value.The beam radius on the Fourier transform lens is reduced by two orders of magnitude compared with the one in the beam combining system without microlens array.

关 键 词：光纤激光器 谱组束 微透镜阵 外腔 衍射积分 

分 类 号：TN248.1[电子电信—物理电子学]