Hundred-watt-level linearly polarized tunable Raman random fiber laser

A high power linearly polarized tunable Raman random fiber laser(RFL) was studied theoretically and experimentally. The parameters required for the system design were obtained through numerical simulation, based on which a hundred-watt-level linearly polarized tunable RFL was successfully demonstrated. The central wavelength can be continuously tuned from 1113.76 to 1137.44 nm, and the output power exceeds 100 W for all of the lasing wavelengths with the polarization extinction ratio(PER) exceeding 20 d B at the maximum output power.Besides, the linewidth, spectral evolution, and temporal dynamics of a specified wavelength(1124.72 nm) were investigated in detail. Moreover, the theoretical results and the experimental results fit well. To the best of our knowledge, this is the first time for a hundred-watt-level linearly polarized tunable RFL ever reported.     

High-power linearly-polarized tunable Raman fiber laser

In this study, we demonstrate an all-fiber high-power linearly-polarized tunable Raman fiber laser system. An inhouse high-power tunable fiber laser was employed as the pump source. A fiber loop mirror(FLM) serving as a high reflectivity mirror and a flat-cut endface serving as an output coupler were adopted to provide broadband feedback. A piece of 59-m commercial passive fiber was used as the Raman gain medium. The Raman laser had a 27.6 nm tuning range from1112 nm to 1139.6 nm and a maximum output power of 125.3 W, which corresponds to a conversion efficiency of 79.4%.The polarization extinction ratio(PER) at all operational wavelengths was measured to be over 21 d B. To the best of our knowledge, this is the first report on a hundred-watt level linearly-polarized tunable Raman fiber laser.     

国产锥形光纤实现4.2kW近单模窄线宽激光

<正>近年来,高功率窄线宽光纤激光在非线性频率变换、光束合成等领域有广泛的应用需求。受限于非线性效应[受激拉曼散射（SRS）和受激布里渊散射（SBS）]和模式不稳定（TMI）效应等,目前基于常规商用大模场光纤实现了最高5kW级的窄线宽掺镱光纤激光输出。纤芯直径沿光纤纵向变化的锥形光纤逐渐被用于高功率光纤激光器中,在抑制非线性效应、保持光束质量等方面展现了优势。目前,基于锥形光纤实现了最高5kW级的宽谱光纤激光输出。