Naderi Nader A, Flores Angel, Anderson Brian M, Dajani Iyad
Opt Lett. 2016 Sep 1;41(17):3964-7. doi: 10.1364/OL.41.003964.
We report power scaling results of a highly efficient narrow-linewidth monolithic Yb-doped fiber amplifier seeded with two signals, operating at 1038 and 1064 nm. With the appropriate seed power ratio applied, this technique was shown to suppress stimulated Brillouin scattering in conjunction with phase modulation, while generating the output power in predominantly the longer wavelength signal. Notably, the integration of laser gain competition with pseudo-random bit sequence phase modulation, set at a clock rate of 2.5 GHz and utilizing an optimized pattern to match the shortened effective nonlinear length, yielded 1 kW of output power. The beam quality was measured to be near the diffraction limit with no sign of transverse mode instability. Furthermore, the coherent beam combination performance of the amplifier provided a 90% combining efficiency with no indication of spectral broadening when compared to the single-tone case. Overall, the power scaling results represent a significant reduction in spectral linewidth compared to that of commercially available narrow-linewidth Yb-doped fiber amplifiers.
我们报告了一种高效窄线宽单片掺镱光纤放大器的功率缩放结果，该放大器由两个分别在1038纳米和1064纳米波长运行的信号种子注入。通过应用适当的种子功率比，该技术被证明在相位调制的协同作用下能够抑制受激布里渊散射，同时主要在较长波长信号中产生输出功率。值得注意的是，将激光增益竞争与伪随机比特序列相位调制相结合，设置时钟速率为2.5吉赫兹，并利用优化模式来匹配缩短的有效非线性长度，产生了1千瓦的输出功率。测量得到的光束质量接近衍射极限，没有横向模式不稳定的迹象。此外，与单音情况相比，该放大器的相干光束合成性能提供了90%的合成效率，且没有光谱展宽的迹象。总体而言，与市售窄线宽掺镱光纤放大器相比，功率缩放结果表明光谱线宽显著减小。
