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基于稳态条件下描述光纤中受激拉曼散射效应的光功率耦合方程组,提出一种新的多波长级联拉曼光纤激光器的设计算法。结合遗传算法和打靶法的优点,采取对每一代种群中少数优良个体进行几次打靶,使得种群中目标函数最优化值附近的个体加速收敛。以500 m掺磷光纤为增益介质、光纤布拉格光栅构成谐振腔的三波长(1427 nm,1455 nm,1480 nm)级联拉曼光纤激光器为例,采用该算法计算了其输出特性。结果表明,总输出功率与抽运功率近似成线性关系,斜率效率约51%;由于谐振腔中三个输出波长相互之间的受激拉曼散射作用产生的能量转移,使得输出的长波长斯托克斯光斜率效率大于短波长斯托克斯光斜率效率。
Based on the optical power coupling equations describing the stimulated Raman scattering effect in optical fiber under steady-state conditions, a new design algorithm of multiwavelength cascaded Raman fiber laser is proposed. Combining with the advantages of genetic algorithm and shooting method, a few shots were made on a few excellent individuals in each generation to accelerate the convergence of individuals in the population near the optimal objective function. The output characteristic of a Raman fiber laser with three wavelengths (1427 nm, 1455 nm, 1480 nm) consisting of a 500 μm doped fiber as the gain medium and a fiber Bragg grating resonator is taken as an example. The results show that the total output power is approximately linear with the pumping power and the slope efficiency is about 51%. Due to the energy transfer caused by the stimulated Raman scattering of the three output wavelengths in the resonator, the output long wavelength The TOKK light slope efficiency is greater than the STW light slope efficiency.