Focus conditioning effects on molecular field-free alignment observed with high-order harmonic generation  

作　　者：吴家骏 尉鹏飞 

机构地区：[1]College of Physics and Electronic Information Engineering,Wenzhou University [2]Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences

出　　处：《中国激光》2012年第8期31-34,共4页Chinese Journal of Lasers

基　　金：supported by the Open Fund of the State Key Laboratory of High Field Laser Physics(Shanghai Institute of Optics and Fine Mechanics);the National Natural Science Foundation of China(No.61108012);the College Student′s Science and Technology Innovation Project of Zhejiang Province(No.2011R424015);the Science and Technology Project of Wenzhou City(No.S20110014)

摘　　要：We investigate the focus conditioning effects on molecular field-free alignment observed with high-order harmonic generation(HHG) from CO2 molecules.We also experimentally demonstrate that both the spectral shape and alignment signal of HHG significantly vary with changing focus position.A maximal alignment signal is achieved at a given focus position because of the optimal intensity of the driving laser.This intensity is related to the ionization potential of the molecules.These results indicate that a unique focus position provides an optimal alignment signal for practical applications.We investigate the focus conditioning effects on molecular field-free alignment observed with high-order harmonic generation（HHG） from CO2 molecules.We also experimentally demonstrate that both the spectral shape and alignment signal of HHG significantly vary with changing focus position.A maximal alignment signal is achieved at a given focus position because of the optimal intensity of the driving laser.This intensity is related to the ionization potential of the molecules.These results indicate that a unique focus position provides an optimal alignment signal for practical applications.

关 键 词：高次谐波产生 现场校准 分子场 调理 焦点位置 定位信号 激光强度 电离电势 

分 类 号：TN24[电子电信—物理电子学] TP212[自动化与计算机技术—检测技术与自动化装置]