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Appl. Sci. 2019, 9(2), 282; https://doi.org/10.3390/app9020282

Enhancement of High-Order Harmonic Generation due to the Large Gradient of the Electric Field Amplitude

Hubei Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan 430205, China
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Received: 11 December 2018 / Revised: 9 January 2019 / Accepted: 10 January 2019 / Published: 14 January 2019
(This article belongs to the Special Issue Attosecond Science and Technology: Principles and Applications)
PDF [1058 KB, uploaded 14 January 2019]

Abstract

The influence of the waveform of circularly polarized laser field on high-order harmonic (HH) generation from atoms is investigated by solving the time-dependent Schrödinger equation (TDSE) and by classical trajectory analysis, without assuming an initial transverse velocity. Both the HH simulation and the classical trajectory calculation demonstrate that the positive temporal gradient of the electric field amplitude is a key factor that makes the electron return to the parent ion possible. Moreover, the larger the temporal gradient of the field amplitude is, the more the electron trajectories will revisit the parent ion. Correspondingly, the enhancement of HH is observed. This is confirmed by the pulse-duration dependence of the harmonic yield driven by a circularly polarized laser field.
Keywords: circularly polarized laser pulse; strong field physics; high-order harmonic generation; pulse duration dependence of the harmonic yield circularly polarized laser pulse; strong field physics; high-order harmonic generation; pulse duration dependence of the harmonic yield
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Qin, M.; Zeng, Y.; Zeng, X.; Liao, Q. Enhancement of High-Order Harmonic Generation due to the Large Gradient of the Electric Field Amplitude. Appl. Sci. 2019, 9, 282.

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