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Chin. Phys. B, 2020, Vol. 29(5): 053201    DOI: 10.1088/1674-1056/ab821b
ATOMIC AND MOLECULAR PHYSICS Prev   Next  

Semi-integer harmonic generation from an argon atom by bichromatic counter-rotating circularly polarized laser field

Tong Qi(齐桐), Xiao-Xin Huo(霍晓鑫), Jun Zhang(张军), Xue-Shen Liu(刘学深)
Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
Abstract  We theoretically investigated the properties of the high-order harmonic generation from an argon atom by bichromatic counter-rotating circularly polarized (BCCP) laser field. The harmonic emission processes have been illustrated by numerically solving the two-dimensional time-dependent Schrödinger equation of an atom in intense laser fields. It is found that with the decrease of the right-circularly polarized laser wavelength, the harmonic spectra are gradually splitting and the harmonic orders move towards the higher frequency. Meanwhile, the integer and semi-integer harmonic emission will be generated when the frequency ratios of right- and left-circularly polarized lasers are semi-integer. The emission mechanism of the semi-integer-order harmonics has been investigated by using the rules of photon absorption and emission.
Keywords:  high-order harmonic generation      semi-integer-order      photon absorption and emission      bichromatic counter-rotating circularly polarized laser field  
Received:  17 February 2020      Revised:  08 March 2020      Published:  05 May 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. 61575077 and 11904122), the Natural Science Foundation of Jilin Province of China (Grant No. 20180101225JC), and the China Postdoctoral Science Foundation (Grant Nos. 2018M641766 and 2019T120232).
Corresponding Authors:  Jun Zhang, Xue-Shen Liu     E-mail:  jluzjun@jlu.edu.cn;liuxs@jlu.edu.cn

Cite this article: 

Tong Qi(齐桐), Xiao-Xin Huo(霍晓鑫), Jun Zhang(张军), Xue-Shen Liu(刘学深) Semi-integer harmonic generation from an argon atom by bichromatic counter-rotating circularly polarized laser field 2020 Chin. Phys. B 29 053201

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