Generation of non-integer high-order harmonics and significant enhancement of harmonic intensity

doi:10.1088/1674-1056/abd389

Abstract High-order harmonics from helium atom in the orthogonally two-color (OTC) laser field are investigated by solving the two-dimensional time-dependent Schrödinger equation. Non-integer high-order harmonics are obtained in some ratio of frequencies of two components. Pure odd and even harmonics from atoms could be separated in two components by adjusting the ratio of frequencies in OTC scheme, and the resolution of harmonics is improved at the same time. The physical mechanism is explained by the periodicity of dipole. With the same intensity of the incident laser, the intensity of the high-order harmonics from the OTC field scheme is improved by three orders of magnitude compared to the monochromatic laser field scheme. A theoretical scheme is provided for experimentally achieving improving energy resolution and separation of pure odd and even harmonics in atoms. Also, we provide a means for improving harmonic intensity.

Keywords: non-integer high-order harmonic generation the orthogonally two-color laser field the enhancement of harmonic intensity

Received: 03 September 2020
Revised: 09 November 2020
Accepted manuscript online: 15 December 2020

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. 11974229 and 11504221), the Natural Science Foundation of Shanxi Province, China (Grant No. 201901D111288), the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi, China (Grant No. 2019L0452), the Program for the Top Young Academic Leaders of Higher Learning Institutions of Shanxi Province, China.

Corresponding Authors: ^†Corresponding author. E-mail: sxxymiao@126.com

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Chang-Long Xia(夏昌龙), Yue-Yue Lan(兰悦跃), and Xiang-Yang Miao(苗向阳) Generation of non-integer high-order harmonics and significant enhancement of harmonic intensity 2021 Chin. Phys. B 30 043202

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Generation of non-integer high-order harmonics and significant enhancement of harmonic intensity

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