Effects of aligning pulse duration on the degree and the slope of nitrogen field-free alignment  

作　　者：王翡 蒋红兵 龚旗煌 

机构地区：[1]Department of Physics&State Key Laboratory for Mesoscopic Physics,Peking University

出　　处：《Chinese Physics B》2012年第5期288-293,共6页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grants Nos. 10634020,11074014 and 10821062)

摘　　要：Through theoretical analysis,we show how aligning pulse durations affect the degree and the time-rate slope of nitrogen field-free alignment at a fixed pulse intensity.It is found that both the degree and the slope first increase,then saturate,and finally decrease with the increasing pump duration.The optimal durations for the maximum degree and the maximum slope of the alignment are found to be different.Additionally,they are found to mainly depend on the molecular rotational period,and are affected by the temperature and the aligning pump intensities.The mechanism of molecular alignment is also discussed.Through theoretical analysis,we show how aligning pulse durations affect the degree and the time-rate slope of nitrogen field-free alignment at a fixed pulse intensity.It is found that both the degree and the slope first increase,then saturate,and finally decrease with the increasing pump duration.The optimal durations for the maximum degree and the maximum slope of the alignment are found to be different.Additionally,they are found to mainly depend on the molecular rotational period,and are affected by the temperature and the aligning pump intensities.The mechanism of molecular alignment is also discussed.

关 键 词：field-free molecular alignment femtosecond phenomenon strong filed physics 

分 类 号：TN24[电子电信—物理电子学] O561[理学—原子与分子物理]