Controlling the contributions to high-order harmonic generation from different nuclei of N2 with an orthogonally polarizedtwo-color laser field

doi:10.1088/1674-1056/25/9/093202

Abstract The generation of high-order harmonic and the attosecond pulse of the N₂ molecule with an orthogonally polarized two-color laser field are investigated by the strong-field Lewenstein model. We show that the control of contributions to high-order harmonic generation (HHG) from different nuclei is realized by properly selecting the relative phase. When the relative phase is chosen to be φ=0.4π, the contribution to HHG from one nucleus is much more than that from another. Interference between two nuclei can be suppressed greatly; a supercontinuum spectrum of HHG appears from 40 eV to 125 eV. The underlying physical mechanism is well explained by the time-frequency analysis and the semi-classical three-step model with a finite initial transverse velocity. By superposing several orders of harmonics, an isolated attosecond pulse with a duration of 80 as can be generated.

Keywords: high-order harmonic generation orthogonally polarized two-color laser field attosecond pulse

Received: 07 April 2016
Revised: 25 April 2016
Accepted manuscript online:

PACS:	32.80.Rm	(Multiphoton ionization and excitation to highly excited states)
	42.65.Ky	(Frequency conversion; harmonic generation, including higher-order harmonic generation)
	42.65.Re	(Ultrafast processes; optical pulse generation and pulse compression)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11271158, 61575077, and 11574117).

Corresponding Authors: Xue-Shen Liu
E-mail: liuxs@jlu.edu.cn

Cite this article:

Hui Du(杜慧), Xue-Fei Pan(潘雪飞), Hai-Feng Liu(刘海凤), Hong-Dan Zhang(张宏丹), Jun Zhang(张军), Jing Guo(郭静), Xue-Shen Liu(刘学深) Controlling the contributions to high-order harmonic generation from different nuclei of N₂ with an orthogonally polarizedtwo-color laser field 2016 Chin. Phys. B 25 093202

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Controlling the contributions to high-order harmonic generation from different nuclei of N2 with an orthogonally polarizedtwo-color laser field

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Controlling the contributions to high-order harmonic generation from different nuclei of N₂ with an orthogonally polarizedtwo-color laser field