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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 theoretical model of ytterbium-doped fiber laser amplifier, the effects of central wavelength and gain fiber length of ytterbium-doped fiber laser amplifier on amplified luminescent radiation (ASE) were analyzed. According to the calculation result, the design parameters of 1030nm narrow linewidth fiber laser amplifier are optimized. An experimental device based on a narrowband seed source primary amplifier was constructed by using the main oscillator power amplification structure. The center wavelength of 1030 nm, the linewidth of 3dB 0.072 nm and the maximum power of 25 μm / 400 μm (core diameter / cladding diameter) Continuous laser output of 1.01kW, optical - optical conversion efficiency of 81%, 1030nm laser power accounted for more than 99%. According to the theoretical calculation and experimental results, we can see that the commercial optical fiber can realize the high power, high efficiency and high signal-to-noise ratio output of narrow linewidth 1030nm fiber laser after reasonable optimization design.