飞秒激光脉冲在氮气中产生高次谐波的实验研究  

High Harmonic Generation in N_2 Using Intense fs Laser Pulses

作　　者：陈建新[1] 夏元钦[1] 姚琴[1] 王骐[1] 

机构地区：[1]哈尔滨工业大学光电子技术研究所可调谐激光技术国家级重点实验室,哈尔滨150001

出　　处：《光学学报》2002年第6期650-653,共4页Acta Optica Sinica

基　　金：国家科委 86 3高技术计划激光技术主题资助课题

摘　　要：报道了以氮气为介质产生高次谐波的实验结果。实验中主要研究了不同的气体密度、不同入射激光能量和不同偏振对高次谐波辐射强度及谐波级次的影响。并从理论上进行了定性分析。分析结果表明 :要想得到较高次、较强的谐波辐射 ,必须反复进行实验 ,确定最佳的激光能量和气体密度 。The experimental results of high-order harmonic generation in diatomic molecular N2 are presented. The effects of different gas density, different laser energy and different laser polarization on harmonic emission and harmonic order are mainly studied in the experiment. At the same time, the results are analyzed theoretically. It is indicated that the confirmation of the optimal gas density and the incident laser energy are needed in order to get the stronger harmonic emission and to avoid the phase mismatch caused by density increasing of the free electrons.

关 键 词：飞秒激光脉冲 实验研究 高次谐波 氮气 气体密度 入射激光能量 相互作用 激光器 

分 类 号：O437[机械工程—光学工程] TN248[理学—光学]