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利用主振荡功率放大(MOPA)技术,实验研究了两级级联、全光纤结构的窄线宽连续激光放大器。其中,以20dB光谱线宽0.078nm的窄线光纤激光器为信号光源,两个放大级中分别采用光纤侧面耦合器,(6+1)×1光纤合束器实现抽运光功率的耦合,以及使用1053nm单模纤芯的双包层掺镱光纤、大模场面积的掺镱双包层光纤作为增益光纤。在全光纤结构放大器中,对第二级放大级中(6+1)×1抽运光注入端的反向传输光的光谱和功率进行了监测和分析。通过优化增益光纤的长度,抑制了掺镱光纤中自发辐射光的自生激光振荡。在窄线宽激光放大过程中实现了中心波长1053 nm,总放大增益27.6 dB,功率16.09 W的稳定激光输出,没有发现受激布里渊散射和受激拉曼散射等非线性效应。
Using the main oscillator power amplifier (MOPA) technology, two-stage cascaded, all-fiber narrow-linewidth continuous-wave laser amplifier is experimentally studied. Among them, a narrow-band fiber laser with a 20 dB spectral line width of 0.078 nm is used as a signal light source, and the coupling of the pump power is implemented by using a fiber side coupler and a (6 + 1) × 1 fiber combiner in the two amplification stages, respectively Double clad ytterbium doped fiber with 1053nm single mode core and ytterbium doped double clad fiber with large mode area are used as gain fiber. In the all-fiber amplifier, the spectrum and power of the reverse transmitted light at the (6 + 1) × 1 pump-light injection end in the second stage are monitored and analyzed. By optimizing the length of the gain fiber, autogenous laser oscillation of the spontaneous emission light in the ytterbium-doped fiber is suppressed. A stable laser output with a center wavelength of 1053 nm, a total amplification gain of 27.6 dB and a power of 16.09 W was achieved during narrow-line laser amplification. No nonlinear effects such as stimulated Brillouin scattering and stimulated Raman scattering were found.