Analysis of THz generation through the asymmetry of photoelectron angular distributions

Zhou, Zhaoyan; Wang, Xu; Lin, C. D.

doi:10.1103/physreva.95.033418

Title: Analysis of THz generation through the asymmetry of photoelectron angular distributions

Journal Article · Fri Mar 17 00:00:00 EDT 2017 · Physical Review A

DOI:https://doi.org/10.1103/physreva.95.033418· OSTI ID:1535730

Zhou, Zhaoyan ^[1]; Wang, Xu ^[2]; Lin, C. D. ^[3]

Kansas State Univ., Manhattan, KS (United States); National Univ. of Defense Technology, Changsha (China)
China Academy of Engineering Physics, Beijing (China)
Kansas State Univ., Manhattan, KS (United States)

In this work, we analyze the mechanism of THz generation in a gas medium with intense two-color infrared lasers pulses. The dependence of the amplitude of THz emission on the relative phase between the fundamental color (800 nm) and its second harmonic (400 nm) is shown to be identical to the residual current as well as to the asymmetry of the above-threshold-ionization (ATI) photoelectrons along the left versus the right side of the linear polarization axis of the laser, thus confirming the validity of the semiclassical photocurrent model for the THz emission. We further analyze the even vs odd angular momentum distributions of the ATI electrons. The degree of overlap between the even-parity dominant electrons and the odd-parity dominant electrons within each ATI peak determines the strength of the THz emission, thus favoring the model that THz is generated through free-free transitions in the laser field. A model is also provided to obtain the same phase dependence as the four-wave mixing model.

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Research Organization:: Kansas State Univ., Manhattan, KS (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; USDOE

Grant/Contract Number:: FG02-86ER13491

OSTI ID:: 1535730

Alternate ID(s):: OSTI ID: 1347261

Journal Information:: Physical Review A, Vol. 95, Issue 3; ISSN 2469-9926

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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