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Resolving multi-orbital effects on high harmonic generation from aligned N2 molecules in linearly and elliptically polarized intense laser fields

Resolving multi-orbital effects on high harmonic generation from aligned N2 molecules in linearly and elliptically polarized intense laser fields
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摘要 We perform an experimental study of the multi-orbital effect on the high-order harmonic generation(HHG) from aligned N_2 molecules in both linearly and elliptically polarized intense laser fields.Measured by a home-built extreme ultraviolet(XUV) flat grating spectrometer with the pump-probe method, the angular distributions of different orders of HHG are obtained, which show distinctive behaviors for harmonics in the plateau and the cut-off regions.The ellipticity dependence of HHG is investigated by aligning the molecular axis parallel or perpendicular to the laser polarization.Our results indicate that both the highest occupied molecular orbital(HOMO) as well as the lower one(HOMO-1) contribute to the HHG of N2 molecules, in either linearly or elliptically polarized intense laser field.The study paves the way for understanding the ultrafast electron dynamics of molecules exposed to an intense laser field. We perform an experimental study of the multi-orbital effect on the high-order harmonic generation(HHG) from aligned N2 molecules in both linearly and elliptically polarized intense laser fields.Measured by a home-built extreme ultraviolet(XUV) flat grating spectrometer with the pump–probe method, the angular distributions of different orders of HHG are obtained, which show distinctive behaviors for harmonics in the plateau and the cut-off regions.The ellipticity dependence of HHG is investigated by aligning the molecular axis parallel or perpendicular to the laser polarization.Our results indicate that both the highest occupied molecular orbital(HOMO) as well as the lower one(HOMO-1) contribute to the HHG of N2 molecules, in either linearly or elliptically polarized intense laser field.The study paves the way for understanding the ultrafast electron dynamics of molecules exposed to an intense laser field.
作者 Hong-Jing Liang Xin Fan Shuang Feng Li-Yu Shan Qing-Hua Gao Bo Yan Ri Ma Hai-Feng Xu Da-Jun Ding 梁红静;范鑫;冯爽;单立宇;高庆华;闫博;马日;徐海峰;丁大军(Institute of Atomic and Molecular Physics, Jilin University)
出处 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第9期227-231,共5页 中国物理B(英文版)
基金 Project supported by the National Natural Science Foundation of China(Grant Nos.91750104,11127403,and 11474130) the Natural Science Foundation of Jilin Province,China(Grant No.20160101332JC)
关键词 high-order harmonic generation ALIGNED molecule multi-orbital effect elliptically POLARIZED intense laser high-order harmonic generation aligned molecule multi-orbital effect elliptically polarized intense laser
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