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采用一种阶梯排列结构的单管激光器合束技术制成了高亮度半导体激光器光纤耦合模块,可用于泵浦掺Yb3+大模场双包层光纤激光器。利用微透镜组对各单管半导体激光器进行快慢轴准直,在快轴方向实现光束叠加,然后通过两组消球差设计的柱面透镜组分别对合成光束快慢轴方向进行聚焦,耦合进入光纤。实验中将6只输出功率为6 W的976 nm单管半导体激光器输出光束耦合进芯径为105μm、数值孔径为0.15的光纤中,当工作电流为6.2 A时,光纤输出功率达29.0 W,光纤耦合效率达到80.1%,亮度超过4.74 MW/cm2-str。
A high-intensity semiconductor laser fiber coupling module is fabricated by using a single-tube laser combining technology with a step-by-step structure, which can be used for pumping Yb3 + doped large mode field double clad fiber lasers. The micro-lens array is used to collimate the fast and slow axes of the single-tube semiconductor lasers and superpose the beams in the fast axis direction. Then, the cylindrical lenses designed by the two groups of spherical aberration are respectively focused on the slow axis and the slow axis of the composite beam, . In the experiment, 6 output tubes of 976 nm single-tube semiconductor laser with 6 W output power were coupled into an optical fiber with a core diameter of 105 μm and a numerical aperture of 0.15. When the operating current was 6.2 A, the output power of the optical fiber reached 29.0 W, Coupling efficiency of 80.1%, brightness over 4.74 MW / cm2-str.