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Soliton guidance and nonlinear coupling for polarized vector spiraling elliptic Hermite–Gaussian beams in nonlocal nonlinear media

机译:非局域非线性介质中极化矢量螺旋椭圆埃尔米-高斯光束的孤子导引和非线性耦合

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摘要

We investigate the incoherent beams with two orthogonal polarizations in nonlocal nonlinear media, one of which is a fundamental Gaussian beam and the other is spiraling elliptic Hermite–Gaussian beam carrying the orbital angular momentum (OAM). Using the variational approach, we obtain the critical power and the critical OAM required for the vector spiraling elliptic Hermite–Gaussian solitons. In the strong nonlocality region, two components of the vector beam contribute to the nonlinear refractive index in a linear manner by the sum of their respective power. The nonlinear refractive index exhibits a circularly symmetrical profile in despite of the elliptic shapes for spiraling Hermite–Gaussian beams. We find that in the strong nonlocality region, the critical power and the rotational velocity are the same regardless of the relative ratio of the constituent powers. The nonlinear refractive index loses its circular symmetry in weak nonlocality region, and the nonlinear coupling effect is observed. Due to the radiation of the OAM, the damping of the rotation is predicted, and can be suppressed by decreasing the proportion of the spiraling elliptic component of the vector beam.
机译:我们研究了在非局域非线性介质中具有两个正交极化的非相干光束,其中一个是基本高斯光束,另一个是带有轨道角动量(OAM)的螺旋椭圆Hermite-Gaussian光束。使用变分法,我们获得了矢量螺旋椭圆埃尔米-高斯孤子的临界功率和临界OAM。在强非局部区域中,矢量束的两个分量通过它们各自的功率之和以线性方式对非线性折射率有所贡献。尽管有椭圆形的螺旋形的厄米-高斯光束,但非线性折射率仍显示出圆形对称的轮廓。我们发现,在强非局部区域中,临界功率和旋转速度是相同的,而与构成力的相对比例无关。非线性折射率在弱的非局部区域失去圆对称性,并观察到非线性耦合效应。由于OAM的辐射,可以预测旋转的衰减,并且可以通过减小矢量光束的螺旋椭圆分量的比例来抑制旋转衰减。

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  • 来源
    《中国物理:英文版》 |2019年第7期|283-290|共8页
  • 作者

    Chunzhi Sun; Guo Liang;

  • 作者单位

    School of Electrical and Electronic Engineering, Shangqiu Normal University, Shangqiu 476000, China;

    School of Electrical and Electronic Engineering, Shangqiu Normal University, Shangqiu 476000, China;

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