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根据半导体激光器和单模光纤模场分布特点,用模式耦合理论研究了单模光纤与半导体激光器的耦合,结果表明将光纤端面制作成楔形微透镜可以使光纤与半导体激光器的耦合满足模场匹配和相位匹配的要求。用遗传算法对楔形光纤微透镜参数进行优化,得到楔角为88°,柱透镜半径为3.44μm,耦合距离为6.13μm时耦合效率达到最佳值,用Zemax光学仿真软件对耦合模型进行仿真,得到耦合效率为88.9%,耦合好的模块经激光点焊及高低温环境测试后,得到最大耦合效率为81.36%。实验结果与仿真结果相差不大,耦合输出功率满足了作为光纤激光器种子源的功率要求。
According to the mode field distribution characteristics of the semiconductor laser and the single mode fiber, the coupling between the single mode fiber and the semiconductor laser is studied by the mode coupling theory. The results show that the coupling of the fiber and the semiconductor laser satisfies the mode matching and Phase matching requirements. The parameters of the wedge-shaped fiber micro-lens were optimized by using genetic algorithm, the best coupling efficiency was achieved when the wedge angle was 88 °, the radius of the cylindrical lens was 3.44μm and the coupling distance was 6.13μm. The coupling model was simulated by Zemax optical simulation software, The coupling efficiency was 88.9%. After the coupling of the module with laser spot welding and high and low temperature environment, the maximum coupling efficiency was 81.36%. The experimental results show little difference with the simulation results, and the output power of coupling meets the power requirement as the seed source of fiber laser.