V型稠密介质中脉宽对超短脉冲和频谱及其CEP依赖性的影响  

Effects of Pulse Width on Ultrashort Pulse and Spectrum and Their CEP-dependence in a V-type Dense Medium

作　　者：梁变[1] 刘中波[1] 贾克宁[1] 梁颖[1] 樊锡君[1] 

机构地区：[1]山东师范大学物理与电子科学学院

出　　处：《计算物理》2011年第6期889-894,共6页Chinese Journal of Computational Physics

基　　金：国家自然科学基金(10875072);中国科学院上海光机所强场激光物理国家重点实验室资助项目

摘　　要：利用不含慢变包络近似和旋波近似的全波Maxwell-Bloch方程组的数值解,研究脉宽对稠密V型三能级原子介质中超短激光脉冲和频谱及其载波包络位相(CEP)依赖性的影响.结果表明:脉宽较小时,脉冲分裂数目少,频谱较宽,高频部分显著,CEP的变化对脉冲及频谱的影响较大,尤其对子脉冲间的时间间隔及频谱高频部分强度大小的影响更为显著;随着脉宽的增大,脉冲分裂数目增多,频谱宽度变窄,高频部分强度明显降低,CEP的变化对脉冲及频谱的影响减弱.Effects of pulse width on ultrashort laser pulse and spectrum and their carrier-envelope phase（CEP） dependence in a dense V-type three-level atomic medium are investigated with numerical solutions of a full Maxwell-Bloch equation without slowly varying envelope and rotating wave approximations.It is shown that： As pulse width is small,pulse splitting number is less,spectrum is wide,high-frequency part of the spectrum is significant,CEP has great effect on pulse and spectrum,particularly effect on time interval between sub-pulses and strength of high-frequency part is more obvious;As pulse width increasing,pulse splitting number increases,width of spectrum narrows and high-frequency part of the spectrum decreases gradually,effect of CEP on pulse and spectrum weakens gradually.

关 键 词：超短激光脉冲 频谱 脉宽 载波包络位相 

分 类 号：O437[机械工程—光学工程]