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

doi:10.1088/1674-1056/ab3440

Abstract

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.

Keywords: high-order harmonic generation aligned molecule multi-orbital effect elliptically polarized intense laser

Received: 15 May 2019
Revised: 02 July 2019
Accepted manuscript online:

PACS:	42.65.Ky	(Frequency conversion; harmonic generation, including higher-order harmonic generation)
	33.20.Xx	(Spectra induced by strong-field or attosecond laser irradiation)
	33.80.Rv	(Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states))

Fund:

Project supported by the National Natural Science Foundation of China (Grant Nos. 91750104, 11127403, and 11474130) and the Natural Science Foundation of Jilin Province, China (Grant No. 20160101332JC).

Corresponding Authors: Ri Ma
E-mail: rma@jlu.edu.cn

Cite this article:

Hong-Jing Liang(梁红静), Xin Fan(范鑫), Shuang Feng(冯爽), Li-Yu Shan(单立宇), Qing-Hua Gao(高庆华), Bo Yan(闫博), Ri Ma(马日), Hai-Feng Xu(徐海峰), Da-Jun Ding(丁大军) Resolving multi-orbital effects on high harmonic generation from aligned N₂ molecules in linearly and elliptically polarized intense laser fields 2019 Chin. Phys. B 28 094211

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

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