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结合Er/Yb共掺双包层光纤(EYDCF)和主振荡功率放大(MOPA)技术,采用高功率多模抽运方式设计和实验研究了全光纤化两级放大器。分析了放大器的各种性能参数;1550 nm连续光放大得到最大斜率效率为29%,最大输出功率1.52 W,功率稳定度0.4%;2 kHz脉冲放大时得到最大输出功率1.1 W,功率稳定度0.45%,最大斜率效率25%。并从放大后光谱和时域波形分析了导致脉冲放大时斜率效率和功率转换效率较低的主要原因为Yb3(?)离子波段放大自发辐射(ASE)的出现和Er离子波段ASE的过多积累。在高功率放大时,增益随输入信号功率增大迅速下降;同时结合抽运光频谱随驱动电流变化分析了其对放大器性能的影响。
Combining the Er / Yb co-doped double-clad fiber (EYDCF) and the main oscillating power amplifier (MOPA), a full-fiber two-stage amplifier was designed and experimentally studied by using high power multi-mode pumping. The performance parameters of the amplifier were analyzed. The maximum slope efficiency was 29% at 1550 nm, the maximum output power was 1.52 W, and the power stability was 0.4%. The maximum output power was 1.1 W at 2 kHz pulse amplification and the power stability was 0.45 %, Maximum slope efficiency of 25%. The main reasons for the lower slope efficiency and power conversion efficiency resulting from impulse amplification are the appearance of amplified spontaneous emission (ASE) in the Yb3 (?) Ion band and the excessive accumulation of ASE in the Er ion band from the amplified spectra and the time domain waveforms . At high power amplification, the gain decreases rapidly with the increase of input signal power. In the meantime, the influence of the pump spectrum on the amplifier performance is analyzed in combination with the change of drive current.