多模光纤受激布里渊散射非相干组束的机理及理论模型
Mechanism and theoretical model of incoherent beam combining using stimulated Brillouin scattering in multimode fibers
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摘要: 基于布里渊散射耦合强度方程，分析了多模光纤受激布里渊散射非相干组束的机理，建立了其非相干组束的理论模型，并依据模型进行了理论计算。结果表明：在较长的多模光纤中，受激布里渊散射产生的Stokes光以LP01模传输；其非相干组束过程是混合光分解成线偏振光的逆过程；计算的组束功率与T.H.Russel等人的实验结果相一致。最后，分析了组束光强的分布，表明了组束光强对模场尺寸的依赖关系，证明提高组束光强的有效措施是减小组束光的模场半径。Abstract: Based on the coupled differential equations of Brillouin scattering on laser intensity, the mechanism of incoherent beam combining using stimulated Brillouin scattering was analyzed in multimode fibers. The result shows that the Stokes beam generated propagates in the LP01 mode, and the process of incoherent beam combing is an inverse process that the mixed beams are decomposed into the linearly polarized beam. The incoherent beam combining by stimulated Brillouin scattering was modeled, and the combined output power was calculated. The calculated output powers are consistent with Russel’s experimental results. The intensity distribution of the combined beam was also investigated. It shows that the combined intensity depends on the mode field size, the effective approach to increase the c
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