Effects of pressure and gas-jet thickness on the generation of attosecond pulse  

作　　者：李小勇 王国利 周效信 

机构地区：[1]College of Physics and Electronic Engineering, Northwest Normal University [2]Experimental Center, Northwest University for Nationalities

出　　处：《Chinese Physics B》2014年第1期177-180,共4页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.11264036 and 11064013)

摘　　要：We investigate how the intensity and duration of an attosecond pulse generated from high-order harmonic generation are affected by the pressure and thickness of the gas jet by taking into account the macroscopic propagation of both fun- damental and harmonic fields. Our simulations show that, limited by the propagation effects, especially the absorption of harmonics, the intensity of an attosecond pulse cannot be improved by just independently increasing the gas pressure or the medium length. On the other hand, due to good phase-matching conditions, the duration of a generated attosecond pulse can be improved by changing the gas pressure.We investigate how the intensity and duration of an attosecond pulse generated from high-order harmonic generation are affected by the pressure and thickness of the gas jet by taking into account the macroscopic propagation of both fun- damental and harmonic fields. Our simulations show that, limited by the propagation effects, especially the absorption of harmonics, the intensity of an attosecond pulse cannot be improved by just independently increasing the gas pressure or the medium length. On the other hand, due to good phase-matching conditions, the duration of a generated attosecond pulse can be improved by changing the gas pressure.

关 键 词：high-order harmonic generation attosecond pulse macroscopic propagation 

分 类 号：TN24[电子电信—物理电子学] O413[理学—理论物理]