Spectral redshift of high-order harmonics by adding a weak pulse in the falling part of the trapezoidal laser pulse

doi:10.1088/1674-1056/27/2/024206

Abstract

We investigate the spectral redshift of high-order harmonics of the H₂⁺ (D₂⁺) molecule by numerically solving the non-Born-Oppenheimer time-dependent Schrödinger equation (TDSE). The results show that the spectral redshift of high-order harmonics can be observed by adding a weak pulse in the falling part of the trapezoidal laser pulses. Comparing with the H₂⁺ molecule, the shift of high-order harmonic generation (HHG) spectrum for the D₂⁺ molecule is more obvious. We employ the spatial distribution in HHG and time-frequency analysis to illustrate the physical mechanism of the spectral redshift of high-order harmonics.

Keywords: high-order harmonic generation spectral redshift trapezoidal laser pulse spatial distribution

Received: 17 September 2017
Revised: 13 October 2017
Accepted manuscript online:

PACS:	42.65.Ky	(Frequency conversion; harmonic generation, including higher-order harmonic generation)
	32.80.Rm	(Multiphoton ionization and excitation to highly excited states)
	78.67.Bf	(Nanocrystals, nanoparticles, and nanoclusters)

Fund:

Project supported by the National Natural Science Foundation of China (Grant No. 61575077) and the Graduate Innovation Fund of Jilin University (Grant No. 2017107).

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

About author: 42.65.Ky; 32.80.Rm; 78.67.Bf

Cite this article:

Xue-Fei Pan(潘雪飞), Jun Zhang(张军), Shuai Ben(贲帅), Tong-Tong Xu(徐彤彤), Xue-Shen Liu(刘学深) Spectral redshift of high-order harmonics by adding a weak pulse in the falling part of the trapezoidal laser pulse 2018 Chin. Phys. B 27 024206

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