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中文摘要：
搭建了一台基于双包层掺镱光纤的全光纤结构1091nm主振荡功率放大（MOPA）激光器。种子源为自行搭建的线形驻波腔掺镱光纤振荡器，最大输出功率为56mw，放大的自发辐射（ASE）抑制比大于35dB。通过两级预放结构放大后，种子功率达到3w。主放级为一个大模场双包层掺镱光纤放大器，最大输出功率达到41．6W，斜率效率为75％。由于种子源利用窄带高反光纤光栅进行选频，输出光3dB线宽小于0．1nm。经过光谱仪测试，输出光中无明显的剩余抽运光成分，ASE抑制比大于22dB。
英文摘要：
An all-fiber 1 091 nm laser based on dual-clad ytterbium-doped fiber was constructed in master oscillator power amplifier（MOPA） configuration. The in-house-built seed source was an ytterbium- doped fiber oscillator employing a linear resonant cavity. The maximal output power of the seed laser was 56 mW and the amplified spontaneous emission （ASE） was suppressed by a factor of 35 dB. The seed power was boosted to 3 W by a two-stage pre-amplifier. The main amplification stage was a large mode-field area （LMA） ytterbium-doped double clad amplifier with 41.6 W maximal output power and 75% slope efficiency. The 3 dB linewidth of output light was narrower than 0.1 nm for the using of narrow- bandwidth high-reflectivity fiber grating. No residual pump light was observed by spectrometer, and the ASE was suppressed by over 22 dB.
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