1030nm千瓦级掺镱光纤窄线宽激光放大器

1030nm Kilowatt-Level Ytterbium-Doped Narrow Linewidth Fiber Amplifier

基于掺镱光纤激光放大器理论模型,分析了掺镱光纤激光放大器中心波长和增益光纤长度等因素对放大发光辐射(ASE)的影响。根据计算结果,优化了1030nm窄线宽光纤激光放大器设计参数。采用主振荡功率放大结构,搭建了基于窄带种子源一级放大器的实验装置,使用25μm/400μm(纤芯直径/包层直径)掺镱光纤实现了中心波长1030nm、3dB线宽0.072nm、最高功率1.01kW的连续激光输出,光-光转换效率为81%,1030nm激光功率占比大于99%。由理论计算和实验结果可知,经过合理的优化设计,采用商用光纤可实现窄线宽1030nm光纤激光器高功率、高效率、高信噪比输出。

Based on the model of ytterbium doped fiber amplifier and the effect of the central wavelength of the amplifier and the length of gain fiber on amplified spontaneous emission （ASE） is analyzed. According to the calculation results, the 1030 nm narrow linewidth fiber laser amplifier is optimized. Adopting the structure of master oscillator power amplifier （MOPA）, a continuous wave （CW） laser with central wavelength of 1030 nm, 3 dB linewidth of 0. 072 nm and maximum power of 1.01 kW is achieved with narrow band seed and one stage amplifier, in which 25 μm/400μm （diameters of core/cladding） ytterbium-doped fiber is used as the gain fiber. The optical-to-optical conversion efficiency is 81%, and 1030 nm output power is more than 99% of total output power. The calculated and experimental results show that by reasonable optimization design, 1030 nm narrow linewidth CWfiber amplifier with high power, high efficiency and high signal noise ratio can be achieved.