Study on high-efficiency, high-power orange light source by Yb-doped photonics bandgap fiber

本文研究了利用光子带隙光纤（PBGFs）作为黄橙高功率光源的光谱控制光纤激光源。通过抑制高增益波长的放大自发发射（ASE），可以实现Yb增益带长波翼的功率缩放，这在传统激光器中是不可能实现的。首次展示了输出功率为167 W、斜率效率为61%的1178 nm激光辐射和二次谐波产生输出功率为14.5 W的589 nm激光辐射。研制了1178 nm全光纤振荡器和单频源。研究表明，PBGF不仅可以抑制ASE，还可以抑制受激非线性散射，这表明了PBGF激光器的巨大潜力。

We have investigated spectrally-controlled fiber laser sources by photonic bandgap fibers (PBGFs) for yellow-orange high-power light sources. By inhibiting amplified spontaneous emission (ASE) at high-gain wavelengths, power scaling at the long-wavelength wing of the Yb gain band is enabled, that have not been possible in conventional lasers. An 1178 nm laser radiation with a 167 W output power and 61% slope efficiency, as well as a 589 nm laser radiation with a 14.5 W output power by second-harmonics generation have been demonstrated for the first time. An 1178 nm all-fiber fiber oscillator and a single-frequency source have been developed. We have shown PBGFs can suppress not only ASE but stimulated nonlinear scattering, that presents a great potential of the PBGF laser.