Two-center interference in high-harmonic generation of H2+ in a combination of a mid-infrared laser field and a terahertz field

doi:10.1088/1674-1056/26/1/013202

Abstract We theoretically investigate the two-center interference in high-order harmonics generated from the H₂⁺ in a combination of a mid-infrared laser and a terahertz field by numerically solving the time-dependent Schrödinger equation (TDSE). The interference minima in high-order harmonic generation (HHG) are effectively suppressed when a THz field is added. The contribution to HHG from the two separate nuclei is used to demonstrate the locating order of the harmonic minima. Furthermore, we also investigate the emission time of harmonics. The results show that the intensity of the short path around 60^th order after adding a THz field is stronger than that in the mid-infrared laser field, which further illustrates the suppression of the interference minima in HHG.

Keywords: terahertz field high-order harmonic two-center interference

Received: 07 June 2016
Revised: 10 October 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. 61575077, 11574117, and 11271158) and the Graduate Innovation Fund of Jilin University, China (Grant No. 2016153).

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

Cite this article:

Jun Zhang(张军), Xue-Fei Pan(潘雪飞), Tong-Tong Xu(徐彤彤), Hong-Dan Zhang(张宏丹), Hui Du(杜慧), Jing Guo(郭静), Xue-Shen Liu(刘学深) Two-center interference in high-harmonic generation of H₂⁺ in a combination of a mid-infrared laser field and a terahertz field 2017 Chin. Phys. B 26 013202

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Two-center interference in high-harmonic generation of H2+ in a combination of a mid-infrared laser field and a terahertz field

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Two-center interference in high-harmonic generation of H₂⁺ in a combination of a mid-infrared laser field and a terahertz field