An extended model of the quantum free-electron laser

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Brown, M. S. and Henderson, J. R. and Campbell, L. T. and McNeil, B. W. J. (2017) An extended model of the quantum free-electron laser. Optics Express, 25 (26). pp. 33429-33438. ISSN 1094-4087 (https://doi.org/10.1364/OE.25.033429)

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Abstract

Previous models of the quantum regime of operation of the Free Electron Laser (QFEL) have performed an averaging and the application of periodic boundary conditions to the coupled Maxwell – Schrödinger equations over short, resonant wavelength intervals of the interaction. Here, an extended, one-dimensional model of the QFEL interaction is presented in the absence of any such averaging or application of periodic boundary conditions, the absence of the latter allowing electron diffusion processes to be modeled throughout the pulse. The model is used to investigate how both the steady-state (CW) and pulsed regimes of QFEL operation are affected. In the steady-state regime it is found that the electrons are confined to evolve as a 2-level system, similar to the previous QFEL models. In the pulsed regime Coherent Spontaneous Emission (CSE) due to the shape of the electron pulse current distribution is shown to be present in the QFEL regime for the first time. However, unlike the classical case, CSE in the QFEL is damped by the effects of quantum diffusion of the electron wavefunction. Electron recoil from the QFEL interaction can also cause a diffusive drift between the recoiled and non-recoiled parts of the electron pulse wavefunction, effectively removing the recoiled part from the primary electron-radiation interaction.

ORCID iDs

Brown, M. S., Henderson, J. R., Campbell, L. T. ORCID logoORCID: https://orcid.org/0000-0003-1375-1551 and McNeil, B. W. J. ORCID logoORCID: https://orcid.org/0000-0002-7267-611X;
  • Item type:Article
    ID code:62771
    Dates:
    Date
    Event
    25 December 2017
    Published
    20 December 2017
    Accepted
    2017
    Submitted
    Subjects:Science > Physics > Optics. Light
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:09 Jan 2018 11:55
    Last modified:22 Dec 2024 01:19
    URI:https://strathprints.strath.ac.uk/id/eprint/62771
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