拉曼效应对负折射介质中超短脉冲传输的影响  

Influence of Raman Effect on the Propagation Properties of Ultrashort Pulse in Metamaterials

作　　者：张景贵[1] 李勇帆[1] 赵晋琴[1] 

机构地区：[1]湖南第一师范学院信息科学与工程系,湖南长沙410205

出　　处：《量子光学学报》2013年第1期70-75,共6页Journal of Quantum Optics

基　　金：湖南省高校科技创新团队支持计划(湘教通[2010]212号);湖南省科技计划项目(2010GK3049);教育部人文社会科学规划基金项目;情感计算在构建和谐人机交互的网络远程教育系统中的应用研究(12YJAZH065);"湖南第一师范学院重点建设学科--<教育技术学>学科项目";湖南省教改课题(2011(462));湖南省自然科学基金(编号:12JJ4063)

摘　　要：通过数值法对包含拉曼延迟响应的(3+1)维非线性薛定谔方程进行求解,研究了超短脉冲激光在负折射介质中传输时拉曼效应对自聚焦传输特性的影响,着重分析其不同与常规介质的反常传输现象。结果表明:由于负的折射率影响,拉曼效应将导致超短脉冲在自聚焦过程中频谱发生蓝移现象,这与常规介质对应情形相反;而它对负折射介质中超短脉冲的自聚焦特性的影响与常规介质相同,即拉曼效应将诱导自聚焦效应首先发生在脉冲的前沿。本文研究工作对将来利用负折射介质来操控超短光脉冲串产生、自聚焦等许多实际应用领域研究具有重要的指导意义。Influence of Raman effect on self-focusing propagation properties of ultrashort laser pulse in metamaterials is studied through numerical solutions of （3＋1）-dimensional nonlinear Schr6dinger equation including the contribution of the Raman delayed response, and the especial attention is paid to the anomalous propagation phenomena not found in ordinary materials. It is found that Raman effect will lead to the occurrence of the blueshifted frequencies during the self-focusing process of ultrashort pulse, opposite to the corresponding case in ordinary materials. However, its influence on the self-focus properties of the self-focusing of ultrashort pulse is the same as the case in ordinary materials, namely, it will make the self- focus occurring firstly in the leading part of pulse. Our works are of very important sigrlificance in the practical application, such as controlling a train of ultrashort pulse and self focus etal by using metamaterials.

关 键 词：非线性光学 负折射介质 超短脉冲 拉曼效应 

分 类 号：O431[机械工程—光学工程]