非相干多分量空间双稳态孤子

非相干多分量光束在高阶非线性介质中可以形成双稳态孤子.利用相干密度法首次得到了非相干多分量双稳态孤子的解析表达式.介质的高阶非线性决定了双稳态孤子的存在范围和峰值强度.得到了光束的截止波长，最小宽度和介质的非线性条件，并研究了非相干多分量光束中相干分量的传输演化.利用稳定性条件，严格证明了非相干多分量双稳态孤子在介质中可以保持稳定传播. 关键词： 非相干多分量光束 空间孤子 双稳态

Incoherent multimode spatially bistable soliton

Incoherent multimode bistable soliton can exist in higher-order nonlinearity media. Using the coherent density method, we obtain the analytical expression of the incoherent multimode bistable soliton, and the higher-order nonlinearity controls the existence and the intensity peak of bistable solitons. We find the cut-off wavelength, the minimum width of the incoherent beam and the nonlinearity condition for the media, and then we study the propagation characteristics of coherent components that consist of incoherent multimode beams. According to the stability criterion, we demonstrate rigorously that the incoherent multimode bistable soliton can propagate stably against small perturbation.