Double optimal density gradients for harmonic generation from relativistically oscillating plasma surfaces

Gao, Jian and Li, Boyuan and Liu, Feng and Cai, Huaipeng and Chen, Min and Yuan, Xiaohui and Ge, Xulei and Chen, Liming and Sheng, Zhengming and Zhang, Jie (2019) Double optimal density gradients for harmonic generation from relativistically oscillating plasma surfaces. Physics of Plasmas, 26 (10). 103102. ISSN 1070-664X (https://doi.org/10.1063/1.5097440)

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Abstract

The influence of plasma density gradients on the harmonic generation process from relativistically oscillating mirror (ROM) is studied experimentally. It is observed that the harmonic intensities from orders of 21 st to 24 th first drop and then reach the maximum value with the increase of plasma scale length L. 2D particle-in-cell simulations are performed to investigate the intensities of high-order harmonics at different L values, which show that there are two optimal scale lengths Lopt for efficient ROM harmonic generation. The two optimal Lopt values are interpreted by a quasi-1D analytical model. By matching the potential energies provided by laser pulse and charge displacement in the plasma with an exponential distributed density profile, the model can quantitatively predict the optimal Lopt at the given laser incidence angle and intensity. Our work is beneficial for better understanding the role of L in ROM harmonic generation and the parameters affecting the optimal Lopt

  • Item type:Article
    ID code:71059
    Dates:
    Date
    Event
    1 October 2019
    Published
    12 September 2019
    Accepted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:09 Jan 2020 15:20
    Last modified:25 Apr 2024 01:12
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/71059
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