Field-free molecular orientation steered by combination of super-Gaussian and THz half-cycle laser pulses

doi:10.1088/1674-1056/ab4cdf

Abstract The molecular orientation created by laser fields is important for steering chemical reactions. In this paper, we propose a theoretical scheme to manipulate field-free molecular orientation by using an intense super-Gaussian laser pulse and a time-delayed terahertz half-cycle pulse (THz HCP). It is shown that the degree of field-free orientation can be doubled by the combined pulse with respect to the super-Gaussian pulse or THz HCP alone. Moreover, different laser intensities, carrier envelop phases, shape parameters, and time delays have great influence on the positive and negative orientations, with other conditions unchanged. Furthermore, it is indicated that the maximum degree and direction of molecular orientation can be precisely controlled by half of the duration of the super-Gaussian pulse. Finally, by adjusting the laser parameters of the super-Gaussian laser pulse and THz HCP, the optimal results of negative orientation and corresponding rotational populations are obtained at different temperatures of the molecular system.

Keywords: molecular orientation terahertz half-cycle pulse super-Gaussian pulse

Received: 17 August 2019
Revised: 06 October 2019
Accepted manuscript online:

PACS:	33.80.-b	(Photon interactions with molecules)
	33.15.Vb	(Correlation times in molecular dynamics)
	33.15.Kr	(Electric and magnetic moments (and derivatives), polarizability, and magnetic susceptibility)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11674198 and 11874241) and the Taishan Scholar Project of Shandong Province, China.

Corresponding Authors: Qing-Tian Meng
E-mail: qtmeng@sdnu.edu.cn

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Qi-Yuan Cheng(程起元), Yu-Zhi Song(宋玉志), Qing-Tian Meng(孟庆田) Field-free molecular orientation steered by combination of super-Gaussian and THz half-cycle laser pulses 2019 Chin. Phys. B 28 113301

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Field-free molecular orientation steered by combination of super-Gaussian and THz half-cycle laser pulses

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