Simulation of THz emission from laser interaction with plasmas |
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Authors: | Bai XuYongda Li Lijun Song |
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Institution: | a Department of Physics, Changchun University of Science and Technology, Changchun 130022, PR China b Institute of Applied Physics, Changchun University, Changchun 130022, PR China |
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Abstract: | One-dimensional particle-in-cell (PIC) program is used to simulate the generation of high power terahertz (THz) emission from the interaction of an ultrashort intense laser pulse with underdense plasma. The spectra of THz radiation are discussed under different laser intensity, pulse width, incident angle and density scale length. High-amplitude electron plasma wave driven by a laser wakefield can produce powerful THz emission through linear mode conversion under certain conditions. With incident laser intensity of 1018 W/cm2, the generated emission is computed to be of the order of several MV/cm field and tens of MW level power. The corresponding energy conversion efficiency is several ten thousandths, which is higher then the efficiency of other THz source and suitable for the studies of THz nonlinear physics. |
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Keywords: | 52 38 &minus r 52 65 &minus y |
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