Li Wei, Ma Pengfei, Chen Yisha, Song Jiaxin, Lai Wenchang, Liu Wei, Zhou Pu, Si Lei
Opt Express. 2022 Jul 18;30(15):26875-26885. doi: 10.1364/OE.463082.
The comprehensive suppression of the stimulated Brillouin scattering (SBS) and transverse mode instability (TMI) is a critical issue for the power scaling of fiber laser with sub-GHz spectral linewidth. In this manuscript, a narrow linewidth and polarization-maintained (PM) fiber amplifier based on tapered Yb-doped fiber (T-YDF) is established, and the effects of spectral linewidth, spectral shape and pump wavelength on the SBS and/or TMI thresholds are investigated. Up to 694 W polarization-maintained fiber laser with just ∼790 MHz linewidth is obtained by combining the advantages of tapered Yb-doped fiber, near-rectangular spectral injection and 915 nm pump manner. This work could provide a well reference solution for the realization of high-power ultra-narrow linewidth fiber lasers.
对于具有亚吉赫兹光谱线宽的光纤激光器的功率缩放而言，全面抑制受激布里渊散射（SBS）和横向模式不稳定性（TMI）是一个关键问题。在本论文中，建立了一种基于锥形掺镱光纤（T-YDF）的窄线宽保偏（PM）光纤放大器，并研究了光谱线宽、光谱形状和泵浦波长对SBS和/或TMI阈值的影响。通过结合锥形掺镱光纤、近矩形光谱注入和915 nm泵浦方式的优点，获得了线宽仅约790 MHz的高达694 W的保偏光纤激光器。这项工作可为实现高功率超窄线宽光纤激光器提供一个很好的参考解决方案。
