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利用双包层掺镱光子晶体光纤(DC-PCF)作为增益光纤,设计制作了全光纤双包层光子晶体光纤放大器。实验制作了匹配DC-PCF的(6+1)×1端面抽运耦合器,6根抽运光纤采用包层直径、纤芯直径分别为105μm和125μm(数值孔径为0.22)的多模光纤,信号光纤采用普通单模光纤。利用套管法制作端面抽运耦合器,并将制作完成的耦合器与DC-PCF直接熔接,再对光子晶体光纤进行锥棒熔接,锥棒输出端面镀1000~1100nm的增透膜,以防止激光反馈对整个放大系统产生影响。对全光纤双包层光子晶体光纤放大器进行测试,使用976nm的抽运源提供能量,信号光使用波长为1064nm、功率为2 W的连续光。当抽运功率达到最大值151.83 W时,最大输出功率为108.1 W,斜率效率为72.7%。输出光斑为很好的基模光斑,体现了光子晶体光纤在具有大模场面积的同时仍能保持基模传输的优良特性。
Using double-clad ytterbium-doped photonic crystal fiber (DC-PCF) as the gain fiber, all-fiber double-clad photonic crystal fiber amplifier was designed. The (6 + 1) × 1 end-face pump coupler matched with DC-PCF was experimentally fabricated. The six pumping fibers were multimode optical fibers with clad diameter and core diameter of 105μm and 125μm respectively (numerical aperture of 0.22) Signal fiber using ordinary single-mode fiber. Using a sleeve method to make an end pumping coupler, and the manufactured coupler is directly fused with a DC-PCF, then the photonic crystal fiber is subjected to taper rod welding, the output end of the taper rod is coated with an antireflection film of 1000 to 1100 nm, so as to prevent Laser feedback has an impact on the entire amplification system. All-fiber double-clad photonic crystal fiber amplifiers were tested using a 976-nm pump source to provide energy, using continuous light with a wavelength of 1064 nm and a power of 2 W. When the pumping power reaches the maximum of 151.83 W, the maximum output power is 108.1 W, and the slope efficiency is 72.7%. The output light spot is a good base mode spot, which reflects the excellent characteristics of the photonic crystal fiber while maintaining the large mode field area while still maintaining the transmission of the fundamental mode.