宽带啁啾脉冲激光非线性传输过程中的时空微扰研究  

The study of spatiotemporal perturbation in the nonlinear propagation of broadband chirped pulsed laser

作　　者：王灿华[1] 章礼富[1] 傅喜泉[1] 文双春[1] 

机构地区：[1]湖南大学计算机与通信学院,微纳光电器件及应用教育部重点实验室,长沙410082

出　　处：《物理学报》2010年第9期6224-6230,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10776008);国家自然科学基金重点项目(批准号:60538010);教育部新世纪优秀人才支持计划;高等学校博士学科点专项科研基金(批准号:20070532075);湖南省科学技术厅科技计划项目(批准号:2009FJ3112)资助的课题~~

摘　　要：基于非线性薛定谔方程推导出大啁啾脉冲的传输方程,利用微扰理论,分析了啁啾脉冲激光的时空不稳定性.理论上比较清楚的阐述了宽带脉冲激光在大啁啾情况下,其时空噪声的相互影响与相互作用情况及脉冲啁啾对噪声微扰调制的影响,发现在相同γI0(非线性系数与峰值强度乘积)的情况下脉冲啁啾对噪声调制的增长没有直接影响.最后我们在实验上利用非线性介质对啁啾脉冲的空间小尺度自聚焦过程进行了部分验证,同时也在数值上对宽带啁啾脉冲的时间噪声调制的增长进行了模拟分析,发现实验结果和模拟分析结论都与理论分析基本一致.In the paper,we extended the propagation equation of the large chirped pulse based on the nonlinear Schrodinger equation,and then analyzed the spatiotemporal instability of chirped pulsed-beam by using the perturbation theory. The influence of the spatiotemporal noise and the effect of chirp on the perturbation modulation of noise of the broadband pulsed-laser with large chirp were investigated theoretically. The results showed that the chirp of pulse has no direct influence on the modulation growth of noise under the same value of γI0 （the product of the nonlinear coefficient and the peak intensity）. Then the spatial small-scale self-focusing of chirped pulse was measured in experiment using nonlinear medium,and the modulation growth of the temporal noise of the broadband chirped pulse were also simulated numerically, and the result was basically consistent with the analysis of perturbation theory.

关 键 词：时空不稳定性 宽带脉冲激光 啁啾 

分 类 号：O437[机械工程—光学工程]