激光与光电子学进展, 2018, 55 (3): 031901, 网络出版: 2018-03-23
中心对称光折变晶体中扭曲孤子的研究 下载: 512次
Twisted Solitons in Centrosymmetric Photorefractive Crystals
摘要
对中心对称光折变晶体中扭曲孤子的形成及其稳定性进行了研究。结果表明: 在自聚焦非线性光格子中, 扭曲孤子存在于半无穷间隙和第一间隙中; 在半无穷间隙中, 扭曲孤子的状态不稳定; 在第一间隙中的扭曲孤子均处于稳定状态, 且存在区域随着晶格深度p的增加而增加; 对于给定的p, 扭曲孤子能流随传播常数b的增加而增加; 在相同的参数下, 阶数高的扭曲孤子占据的格子更多, 且能流更高; 在自散焦非线性光格子中, 扭曲孤子仅存在于半无穷间隙中, 并且所有的扭曲孤子均为不稳定状态; 当b较小时, 扭曲孤子含有较多的振幅振荡, 随着b增加, 扭曲孤子的能流和振幅振荡都变小。
Abstract
The formation and stability of twisted solitons in centrosymmetric photorefractive crystals are investigated. The results show that, in the case of self-focusing nonlinearity optical lattice, the twisted soliton exists in the semi-infinite gap and the first gap. The twisted solitons in the semi-infinite gap are unstable, and which show stable state in the first gap. The existence domain increases with the increase of the lattice depth p. For a given p, the energy flow of the twisted soliton increases with the increase of the propagation constant b. Under the same parameters, the high order twisted solitons occupy more lattice and have a relatively high energy flow. For the self-defocusing nonlinearity optical lattice, the twisted soliton exists only in the semi-infinite gap, and all the twisted solitons are unstable. When b is small, the twisted soliton contains several amplitude oscillations. As b increases, the energy flow of the twisted solitons and the amplitude oscillations become small.
赵冲, 卢克清, 高立许, 惠娟利, 陈卫军. 中心对称光折变晶体中扭曲孤子的研究[J]. 激光与光电子学进展, 2018, 55(3): 031901. Zhao Chong, Lu Keqing, Gao Lixu, Hui Juanli, Chen Weijun. Twisted Solitons in Centrosymmetric Photorefractive Crystals[J]. Laser & Optoelectronics Progress, 2018, 55(3): 031901.