Volume 125, Number 2, January 2019
|Number of page(s)||6|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||21 February 2019|
Enhanced high-order harmonic generation from periodic potentials with initial superposition states
College of Physics and Information Engineering, Shanxi Normal University - Linfen 041004, PRC
Received: 10 October 2018
Accepted: 18 January 2019
We theoretically investigate the high-order-harmonic generation (HHG) from solids in periodic potentials. The harmonic spectrum is simulated by solving the time-dependent Schödinger equation in a monochromatic laser field. The numerical results show that the intensity of the high-order harmonics from the superposition of the conduction band minimum (CBM) and valence band maximum (VBM) states is about three orders of magnitude higher than that from the VBM alone in the plateau region. Our results show that conduction band population in the initial state affects the intensity of HHG. The physical mechanism is discussed by the picture of time-dependent population imaging (TDPI).
PACS: 42.65.Ky – Frequency conversion; harmonic generation, including higher-order harmonic generation / 42.50.Hz – Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift / 78.47.-p – Spectroscopy of solid state dynamics
© EPLA, 2019
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