负折射介质中高阶非线性效应所致啁啾的研究  

Study on chirps induced by the high-order nonlinear effects in the negative refractive media

作　　者：马会芳[1] 杨性愉[1] 

机构地区：[1]内蒙古大学物理科学与技术学院,内蒙古呼和浩特010021

出　　处：《量子电子学报》2009年第3期346-351,共6页Chinese Journal of Quantum Electronics

基　　金：国家自然科学基金资助(60468001)

摘　　要：利用分步傅里叶法对负折射介质中的广义非线性薛定谔方程进行数值模拟,进而分别得到自相位调制、赝五阶非线性、自陡峭、二阶非线性色散所致啁啾及各项非线性所致总啁啾的演变图。从啁啾上分析了负折射介质中各项非线性效应在脉冲传输时的作用,结果表明:负折射介质中,自陡系数取值的正负可控使脉冲中心位置可向前后沿偏移;在正常色散区,赝五阶非线性系数为负时加速脉冲的展宽,二阶非线性色散项系数取正时使脉冲展宽,取负时使脉冲变窄。Based on the generalized nonlinear equation of negative refractive media, the self-phase modu- lation chirp, self-steepening chirp; fake-quintic nonlinearity chirp, second-order nonlinear dispersion chirp and total chirps induced by all nonlinear effects are simulated by using the split-step Fourier method. The results show that the center of the pulse can shift both the leading edge and the trailing edge because ／ the parameter of self-steepening can be negative and positive. In normal dispersion area, the fake-quintic nonlinearity leads to the broadening of pulse if the parameter of fake- quintic nonlinearity is negative, the second-order nonlinear dispersion leads to the broadening of pulse if the parameter of second-order nonlinear dispersion is positive and the compression of pulse if the parameter is negative.

关 键 词：非线性光学 啁啾 分步傅里叶法 负折射介质 二阶非线性色散 

分 类 号：O437[机械工程—光学工程]