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实验研究了半导体激光器双端泵浦的掺铥双包层光纤激光器,获得了最大功率为4.72 W的连续激光输出,在该输出功率下的中心波长为1 997.6 nm并且光谱范围较宽。实验中所采用两个半导体激光器泵浦源的最大入纤功率分别为11.48 W和8.74 W,对应中心波长分别为790.1 nm和787.2 nm。激光器斜率效率为33%。实验分析得出决定耦合系统耦合效率的主要环节是入纤过程中的损耗,包括光纤端面的不理想以及泵浦聚焦光斑与光纤不匹配。实验也证明影响功率提高的关键因素还在于输出端二色镜对激光的透过率和掺杂浓度一定下的增益光纤长度。
Experimental study of the double-pumped double-clad fiber laser with double-ended diode laser diode has been studied. The continuous laser output with the maximum power of 4.72 W is obtained. The center wavelength is 1 997.6 nm at this output power and the spectral range is wide. The maximum input power of two semiconductor laser pump sources used in the experiment are 11.48 W and 8.74 W respectively, corresponding to the center wavelength of 790.1 nm and 787.2 nm respectively. Laser slope efficiency is 33%. Experimental analysis shows that the main factor that determines the coupling efficiency of the coupled system is the loss in the fiber insertion process, including the non-ideal fiber end face and the mismatch between the pump focused spot and the optical fiber. The experiment also proves that the key factor that affects the power increase is the gain fiber length of the output dichroic mirror to the laser transmittance and doping concentration.