Nonlinear Physics Center, Research School of Physics and Engineering, The Australian National University, Canberra, ACT 0200, Australia.
Phys Rev Lett. 2013 Sep 20;111(12):123902. doi: 10.1103/PhysRevLett.111.123902. Epub 2013 Sep 18.
We report on the first experimental observation of self-induced optical mode transformations in nonlocal nonlinear media. We show that the quadrupole Hermite-Gaussian mode experiences complex nonlinear dynamics in a nematic liquid crystal, including power-dependent conversion into a radially symmetric Laguerre-Gaussian mode. The physical mechanism responsible for self-induced transformation is the excitation of internal modes of a metastable quadrupole nonlocal soliton and its subsequent transmutation into a robust soliton with a bright peak surrounded by a bright ring. We also observe the onset of transformations of higher-order modes, proving the generic character of this nonlinear phenomenon.
我们报告了在非局域非线性介质中首次观察到的自诱导光模式变换的实验结果。我们表明，在向列相液晶中，四极厄米-高斯模式经历复杂的非线性动力学，包括依赖于功率的转换为径向对称的拉盖尔-高斯模式。负责自诱导变换的物理机制是激发亚稳四极非局域孤子的内部模式，以及随后转变成具有明亮峰值周围的明亮环的稳定孤子。我们还观察到高阶模式的转换开始，证明了这种非线性现象的普遍性。
