Propagation dynamics of modified hollow Gaussian beams in strongly nonlocal nonlinear media
Propagation dynamics of modified hollow Gaussian beams in strongly nonlocal nonlinear media
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DOI：
10.1088/1054-660x/25/2/025401
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发表时间：
2015-02
期刊：
影响因子：
1.2
通讯作者：
Zhiping Dai;Zhenjun Yang;Shumin Zhang;Zhaoguang Pang;Kaiming You
中科院分区：
文献类型：
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作者：
Zhiping Dai;Zhenjun Yang;Shumin Zhang;Zhaoguang Pang;Kaiming You
研究了一类新的光束：强非局域非线性介质中的修正空心高斯光束。推导了一组传播特性的解析表达式，并进行了一些数值模拟来说明传播特性。研究发现，SNNM中MHGB的演化具有周期性，这是非线性与衍射相互竞争的结果。当输入功率等于临界功率时，MHGB的二阶矩束宽可以像孤立子一样在传输过程中保持不变，否则它会像呼吸器一样周期性变化。但是，横向光强的分布总是随传输距离的增加而变化，这与孤子和呼吸子不同。研究还发现，轴上光强随输入功率的变化曲线可能呈现出凹形、平台形或类高斯形。
We investigate here a new class of optical beams: modified hollow Gaussian beams (MHGBs) in strongly nonlocal nonlinear media (SNNM). A set of analytical expressions for the propagation properties is deduced and some numerical simulations are also carried out to illustrate the propagation properties. It is found that the evolution of the MHGBs in SNNM is periodical, which is the result of the competition between nonlinearity and diffraction. The second-order moment beam width of the MHGBs can keep invariant during propagation like a soliton when the input power equals the critical power, otherwise it varies periodically like a breather. However, the patterns of transverse intensity are always changing with the propagation distance increasing, which is different from solitons or breathers. It is also found that the evolution curve of on-axis intensity may manifest itself in a concave, a platform, or a Gaussian-like shape depending on the input power.