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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 microlens array-based fiber laser external cavity spectroscopy beamcombining scheme is proposed, and a spherical refraction microlens array capable of pre-collimating the outgoing beam of the fiber array is designed. The potential of the bundling system is analyzed. The results show that the designed bundling system can realize the outer-cavity bundle of 12 Er3 + / Yb3 + co-doped fiber. Using the Rayleigh-Someriff diffraction integral theory, the collimation effect of the microlens on the outgoing beam of the optical fiber is analyzed. The results show that the actual focal length of the microlens is different from the design parameters, and the divergent angle of the collimated beam is only the pre-collimated beam 2.7% of the divergence angle, the beam spot radius reaching the Fourier transform lens is reduced by two orders of magnitude compared with the microlens-less grouping system.