强非局域非线性介质中两种空间位置相反Airy光束产生的脱落孤子演化  

Evolution of Shedding Soliton Generated by Two Space-Reversed Shapes of Airy Beams in Strongly Nonlocal Nonlinear Medium

作　　者：文兵 邓杨保 傅喜泉 Wen Bing;Deng Yangbao;Fu Xiquan(Key Laboratory for Micro/Nano-Optoelectronic Devices of Ministry of Education College of Computer Science and Electronic Engineering, Hunan University, Changsha, Hunan 410082, China;College of Information and Electronic Engineering, Hunan City University, Yiyang, Hunan 413002, China)

机构地区：[1]湖南大学信息科学与工程学院微纳光电器件教育部重点实验室,湖南长沙410082 [2]湖南城市学院信息与电子工程学院,湖南益阳413002

出　　处：《激光与光电子学进展》2018年第4期324-332,共9页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61571183;61605045);湖南省自然科学基金(2017JJ1014;2017JJ3012);湖南省教育厅优秀青年基金(15B042)

摘　　要：利用分步傅里叶方法,数值模拟了强非局域非线性介质中两种空间位置相反的Airy光束在不同振幅、截断系数和非局域程度条件下产生的脱落孤子演化。研究结果发现:当光束的振幅增大、截断系数减小和介质的非局域系数减小时,正Airy光束不但主峰能够产生脱落孤子,其旁瓣也能产生脱落孤子,从而导致孤子数目进一步增加。无论振幅、截断系数和非局域系数如何变化,反Airy光束只能在主峰处产生一个脱落孤子,其旁瓣都不能产生脱落孤子。通过调控Airy光束的振幅、截断系数和介质的非局域系数可控制脱落孤子的产生和数目。Under the conditions of different amplitudes, truncation coefficients, and nonlocal degrees, we numerically study the evolution of shedding sohions generated by two kinds of symmetric Airy pulses with space- reversed shapes in a strongly nonlocal nonlinear medium by split-step Fourier method. The results indicate that as the amplitude increases, truncation coefficient and nonlocal coefficient decrease, a tail-leading Airy beam not only generates a shedding soliton at the main lobe, but also generates the shedding solitons at the side-lobes. Thus the number of shedding soliton further increases. However, no matter how the amplitude, truncation coefficient, and nonlocal coefficient change, only one shedding soliton is generated at the main lobe of a tail-trailing Airy beam, while the shedding soliton cannot be generated at the side-lobes. Therefore, we can control the generation and number of shedding soliton by manipulating the amplitude and the truncation coefficient of an Airy beam, and controlling the nonlocal coefficient of a medium.

关 键 词：非线性光学 Airy光束 强非局域 高非线性 演化 

分 类 号：O437[机械工程—光学工程]