Wang Yanshan, Sun Yinhong, Peng Wanjing, Feng Yujun, Wang Jue, Ma Yi, Gao Qingsong, Zhu Rihong, Tang Chun
Appl Opt. 2021 Jul 20;60(21):6331-6336. doi: 10.1364/AO.431081.
In this paper, we demonstrate a high-power, narrow-linewidth, polarization-maintaining fiber amplifier with near-diffraction-limited beam quality. By optimizing the phase modulation signal, a nearly top-hat-shaped spectrum was generated for self-pulsing suppressing. That results in doubling the self-pulsing threshold we got from conventional white noise signal phase modulation with the same optical linewidth. Based on an optimized signal and a high power, polarization-maintaining, counter-pumped fiber amplifier, we obtain a 3.25 kW narrow-linewidth linearly polarized laser output with a linewidth of ∼20, the polarization extinction ratio is about 15 dB, and the is less than 1.22 at the maximum output power. To the best of our knowledge, this is the first demonstration of a narrow-linewidth, linear polarization, all-fiber amplifier with 3.25 kW laser output.
在本文中，我们展示了一种具有近衍射极限光束质量的高功率、窄线宽、保偏光纤放大器。通过优化相位调制信号，产生了近乎平顶形状的光谱以抑制自脉冲。这使得我们在相同光带宽下从传统白噪声信号相位调制获得的自脉冲阈值提高了一倍。基于优化信号和高功率保偏反向泵浦光纤放大器，我们获得了线宽约为20的3.25 kW窄线宽线偏振激光输出，偏振消光比约为15 dB，在最大输出功率下M²小于1.22。据我们所知，这是首次展示输出功率为3.25 kW的窄线宽、线偏振全光纤放大器。
