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采用高功率975 nm多模半导体激光器(LD)作为抽运源,以大模场掺Yb3+双包层光纤(YDCF)作为激光增益介质,运用能够承受较高功率运行的利特罗(Littrow)光栅外腔调谐结构,实现了宽带可调谐激光输出。实验中,双包层光纤采用最优光纤长度14 m,光栅经仔细调整后有效入纤反馈效率约20%,当入纤抽运功率约1.3 W时,激光器达到阈值并开始振荡。通过连续旋转光栅,激光输出波长能在1046~1121 nm之间实现可调谐,可调范围达75 nm。当入纤抽运功率为48 W时,在1089 nm波长处获得最大输出功率23.7 W,相应斜率效率为53%。最后,基于数值模拟简单地分析了激光输出特性,实验结果与数值模拟结果基本保持一致。
A high-power 975 nm multimode semiconductor laser (LD) is used as a pumping source, a Yb3 + double-clad fiber (YDCF) is used as a laser gain medium in a large mode field, and a Littrow grating capable of withstanding higher power is used External cavity tuning structure to achieve broadband tunable laser output. In the experiment, the optimal fiber length of double-clad fiber is 14 m, the grating efficiency is about 20% after the fiber grating is carefully tuned, and the laser reaches the threshold and begins to oscillate when the fiber pumping power is about 1.3 W. By continuously rotating the grating, the laser output wavelength can be tuned between 1046 and 1121 nm with an adjustable range of 75 nm. When the input fiber pumping power is 48 W, the maximum output power of 23.7 W at the wavelength of 1089 nm is obtained, and the corresponding slope efficiency is 53%. Finally, the output characteristics of the laser are simply analyzed based on numerical simulation. The experimental results are in good agreement with the numerical simulation results.