【摘要】 实验采用中心波长975nm的最大输出功率5W的LD作泵源,掺Yb3+双包层光子晶体作增益介质,二色镜和光纤端面构成F P腔。光纤长6m;纤芯直径为3.9μm,对泵光的吸收系数为2300dB/m;内包层直径为200μm,大数值孔径设计(对泵光,数值孔径为0.7)。实验结果表明,在入纤泵浦功率1.73W时获得波长1.078μm、功率1.45W的单模激光,斜率效率为85.1%;模式竞争和自脉动效应是影响激光器输出稳定性能的主要因素。更多还原

【Abstract】 An Yb³⁺-doped double-clad photonic crystal fiber laser was reported.A 5 W maximum output power multimode LD with 975 nm central wavelength was used as the pump source,a 6 m long Yb³⁺-doped double-clad photonic crystal fiber was used as gain medium and the F-P cavity is formed by a dichroic mir-ror and the output face of the fiber in the experiment.The fiber has a single-mode core with a diameter of3.9 μm,which has pump absorption of 2 300 dB/m.The inner cladding has a diameter of 200 μm and is designed with high numerical aperture （0.7 at the pump wavelength）.The laser operates under single-mode state at 1.078 μm,the maximum output power is 1.45 W and the slope efficiency is 85.1 % with respect to the launched pump power of 1.73 W.The mode competition and self-pulsing effect were regarded as the main factors that affect the output stability performance of the laser.更多还原