负折射介质中三阶非线性色散项对超短脉冲传输的影响  

Impact of Ultra-short Pulse Propagation with Third-order Nonlinear Dispersion in Negative Refractive Media

作　　者：张海霞[1] 杨性愉[1] 

机构地区：[1]内蒙古大学物理科学与技术学院,呼和浩特010021

出　　处：《光子学报》2009年第12期3133-3137,共5页Acta Photonica Sinica

基　　金：国家自然科学基金(60468001)资助

摘　　要：采用分步傅里叶法研究了三阶非线性色散项对超短脉冲传输的影响.通过模拟数值计算得出,在德鲁德模型频率选取的一定范围内,三阶非线性色散项对超短脉冲传输所造成的影响是不可忽略的.结果表明:三阶非线性色散项系数取负值时,在正常色散区超短脉冲不对称展宽,脉冲中心向前沿偏移;在零色散点超短脉冲不对称展宽程度加剧并在脉冲前沿形成振荡,脉冲中心向前沿偏移;在反常色散区超短脉冲不对称变窄,脉冲中心仍向前沿偏移.The split step Fourier method is used to simulate the impact of ultra-short pulse with third-order nonlinear dispersion. In the frequency of Drude model of selecting certain range, the impact of third order nonlinear dispersion to ultra-short pulse can not be ignored by numerical calculating. When third-order nonlinear dispersion is negative, the results show that in the normal dispersion, ultra-short pulse is wide asymmetric and pulse central drifts to the forefront; in zero dispersion, the degree of asymmetry broadening of ultra-short pulse inereass and the center of pulse which drifts to the forefront had a oscillation only in the forefront of pulse. In anomalous dispersion, ultra-short pulse is asymmetry narrow, the central of pulse also drifted to the forefront.

关 键 词：负折射介质 三阶非线性色散项 分步傅里叶法 

分 类 号：O437[机械工程—光学工程]