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全光纤结构超荧光光源各级均采用双包层掺镱光纤作为增益介质,中心波长为976 nm和915 nm的多模半导体激光器作为抽运源,利用窄线宽光纤布拉格光栅对宽带超荧光种子源进行滤波,经三级掺镱双包层光纤放大器放大,实现了中心波长分别为1060 nm和1078 nm的窄线宽超荧光稳定输出,输出功率分别达到57.4 W和56.6 W,斜效率分别为66.6%和66.7%,放大后的窄线宽超荧光光源3 d B光谱带宽均为0.05 nm。利用透射式衍射光栅对两路窄线宽超荧光进行光谱合束,实现了104.2 W窄线宽超荧光输出,合束效率为91.3%,光束质量M2<1.7。
All-fiber super-fluorescent light source adopts double-clad ytterbium-doped fiber as gain medium and multi-mode semiconductor laser with center wavelength of 976 nm and 915 nm as pumping source. The narrow-line fiber Bragg grating Source was filtered and amplified by a three-stage Yb-doped double-clad fiber amplifier to achieve a narrow linewidth super-fluorescence stable output with central wavelengths of 1060 nm and 1078 nm respectively, with output efficiencies of 57.4 W and 56.6 W, respectively, with ramp efficiencies of 66.6% and 66.7% respectively. The 3 d B bandwidth of the amplified narrow-line super-fluorescence light source is 0.05 nm. The two lines of narrow line super - fluorescence were spectrally combined by a transmission diffraction grating to achieve a narrow linewidth of 104.2 W with a combined beam efficiency of 91.3% and a beam quality of M2 <1.7.