Spatial solitons in linearly and nonlinearly amplitude-modulated optical lattices

Spatial solitons in linearly and nonlinearly amplitude-modulated optical lattices
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线性和非线性调幅光学晶格中的空间孤子

DOI:
10.1016/j.optcom.2009.10.087
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发表时间:
2010-02
影响因子:
2.4
通讯作者:
Zheng, Jiangbo
Zheng, Jiangbo
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Yin, Guoyan;Dong, Liangwei;Zheng, Jiangbo

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我们证明了线性和非线性调幅(啁啾)谐波晶格可以支持聚焦和散焦饱和介质中的奇数和偶数孤子。与未啁啾的孤子相比,调制晶格改变了孤子的轮廓并扩大了孤子的稳定域。扭曲孤子或“孤子列”,其轮廓呈现出多峰结构,也可以由线性和非线性啁啾晶格支持。与周期晶格形成鲜明对比的是,啁啾晶格显着拓宽了扭曲孤子的存在和稳定域,特别是对于具有更多分量的孤子。聚焦介质中的偶孤子和散焦介质中的扭曲孤子是不稳定的,而聚焦介质中的奇孤子和扭曲孤子在相对较宽的参数窗口中是稳定的。啁啾晶格可以作为线性引导来实现孤子的振荡,这在非啁啾晶格中是不可能的。
We demonstrated that linearly and nonlinearly amplitude-modulated (chirped) harmonic lattices can support odd and even solitons in both focusing and defocusing saturable media. The modulated lattice modifies the profiles and enlarges the stability domains of solitons, comparing with the unchirped one. Twisted solitons, or “soliton trains” whose profiles exhibit multi-peak structures can also be supported by linearly and nonlinearly chirped lattices. In sharp contrast with periodic lattices, chirped lattices remarkably broaden the existence and stability domains of twisted solitons, especially for solitons with more components. While even solitons in focusing media and twisted solitons in defocusing media are unstable, odd and twisted solitons in focusing media are stable in relatively wide parameter windows. Chirped lattice can be used as a linear guidance to realize the oscillation of solitons which is impossible in unchirped lattice.
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