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Dissipative quadratic solitons supported by a localized gain

机译:局部增益支持的耗散二次孤子

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We propose two models for the creation of stable dissipative solitons in optical media with the chi((2)) (quadratic) nonlinearity. To compensate spatially uniform loss in both the fundamental-frequency (FF) and second-harmonic (SH) components of the system, a strongly localized "hot spot" carrying the linear gain is added, acting either on the FF or on the SH component. In both systems, we use numerical methods to find families of dissipative chi((2)) solitons pinned to the "hot spot". The shape of the existence and stability domains may be rather complex. An existence boundary for the solitons, which corresponds to the guided mode in the linearized version of the systems, is obtained in an analytical form. The solitons demonstrate noteworthy features, such as spontaneous symmetry breaking (of spatially symmetric solitons) and bistability.
机译:我们提出了两个模型,用于在具有chi((2))(二次)非线性的光学介质中创建稳定的耗散孤子。为了补偿系统的基频(FF)和二次谐波(SH)分量在空间上的均匀损耗,添加了一个带有线性增益的强局部“热点”,作用于FF或SH分量。在这两个系统中,我们使用数值方法来找到固定在“热点”上的耗散chi((2))孤子族。存在域和稳定性域的形状可能相当复杂。以解析形式获得了孤子的存在边界,该边界对应于系统线性化版本中的引导模式。孤子表现出值得注意的特征,例如(空间对称孤子的)自发对称性破坏和双稳态。

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