Carrier envelope phase effect on the spatial distribution of high-order harmonic generation in asymmetric molecule

doi:10.1088/1674-1056/25/5/053202

Abstract

The spatial distribution in high-order harmonic generation (HHG) from the asymmetric diatomic molecule HeH²⁺ is investigated by numerically solving the non-Born-Oppenheimer time-dependent Schrödinger equation (TDSE). The spatial distribution of the HHG spectra shows that there is little contribution in HHG around the geometric center of two nuclei (z = 1.17 a.u.) and the equilibrium internuclear position of the H nucleus (z = 3.11 a.u.). We demonstrate the carrier envelope phase (CEP) effect on the spatial distribution of HHG in a few-cycle laser pulse. The HHG process is investigated by the time evolution of the electronic density distribution. The time-frequency analysis of HHG from two nuclei in HeH²⁺ is presented to further explain the underlying physical mechanism.

Keywords: high-order harmonic generation spatial distribution asymmetric molecule carrier envelope phase

Received: 21 December 2015
Revised: 13 December 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, 11574117, and 61575077).

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

Cite this article:

Jun Zhang(张军), Hai-Feng Liu(刘海凤), Xue-Fei Pan(潘雪飞), Hui Du(杜慧), Jing Guo(郭静), Xue-Shen Liu(刘学深) Carrier envelope phase effect on the spatial distribution of high-order harmonic generation in asymmetric molecule 2016 Chin. Phys. B 25 053202

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Carrier envelope phase effect on the spatial distribution of high-order harmonic generation in asymmetric molecule

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