双色线偏振激光场驱动H_2^+分子产生椭圆偏振阿秒脉冲  

Elliptically polarized attosecond pulse generation from H_2^+ driven by the two-color linearly polarized field

作　　者：刘航[1] 刘辉[2] 孟凡顺[2] 冯立强[1,3,2] 

机构地区：[1]辽宁工业大学化学与环境工程学院,锦州121001 [2]辽宁工业大学理学院,锦州121001 [3]中国科学院大连化学物理研究所分子反应动力学国家重点实验室,大连116023

出　　处：《原子与分子物理学报》2017年第5期899-907,共9页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(11504151);辽宁省博士启动基金资助的课题(201501123);辽宁省教育厅基金资助的课题(L2014242)

摘　　要：理论研究了双色线偏振激光场驱动H_2^+分子产生椭圆偏振谐波及阿秒脉冲的特点.计算结果表明:随着不同偏振角的引入,谐波光谱呈现不规则的椭圆率.但是,随着空间非均匀效应的引入,不仅谐波谱的椭圆率可以稳定在ε=0.1和ε=0.3之间,而且谐波发射的截止能量明显增强.形成4个具有较小干涉结构带宽在406 e V,299 e V,381 e V和582 e V的超长平台区.最后,通过傅里叶变换,可获得5个脉宽及椭圆率为24 as(ε=0.1),22 as(ε=0.3),24 as(ε=0.3),19 as(ε=0.3),19 as(ε=0.3)的阿秒X射线脉冲.Elliptically polarized harmonic spectra and attosecond pulses generation from H2＋ driven by the two - color linearly polarized pulses have been theoretically investigated. The results show that with the introductions of the different polarized angles, the anomalous elliptically polarized harmonics can be found. But, with the further introduction of the spatial inhomogeneous effect, not only the ellipticities of the harmonics are equal to the stable values of ε = 0. 1 and ε = 0. 3, but also the harmonic cutoffs are enhanced. As a consequence, four supercon- tinua of 406 eV, 299 eV, 381 eV and 582 eV with less harmonic modulations can be obtained. Finally, through Fourier transformation of the spectral continuum, five elliptically polarized attosecond X - ray pulses with dura- tions and ellipticities of 24 as （ ε = 0.1）,22as （ε = 0.3）,24as （ε= 0.3）, 19as （ε= 0.3）, 19as （ε= 0. 3） can be oroduced.

关 键 词：激光物理 高次谐波 椭圆偏振阿秒脉冲 H2^+分子 空间非均匀激光场 

分 类 号：O562.4[理学—原子与分子物理]