Sub-wavelength effects in a free electron laser oscillator

Pongchalee, Pornthep and McNeil, Brian (2023) Sub-wavelength effects in a free electron laser oscillator. Optics Express, 31 (16). pp. 26673-26684. ISSN 1094-4087 (https://doi.org/10.1364/OE.494481)

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Abstract

Previous simulation studies of cavity based free electron lasers (FELs) have utilised models which average the optical field in the FEL interaction over an integer number of radiation wavelengths. In this paper, two unaveraged simulation codes, OPC and Puffin, are combined to enable modelling, for the first time, of a cavity based FEL at the sub-wavelength scale. This enables modelling of effects such as coherent spontaneous emission from the electron beam and sub-wavelength cavity length detuning. A cavity FEL operating in the mid-infrared is modelled and it is shown that, for small sub-wavelength cavity detunings, the FEL can preferentially lase at the third harmonic of the fundamental FEL wavelength. This novel result suggests other modes of operation may be possible and opens up cavity-based FEL operation to investigation of further, potentially useful, modes of operation.

  • Item type:Article
    ID code:86267
    Dates:
    Date
    Event
    31 July 2023
    Published
    26 July 2023
    Published Online
    17 July 2023
    Accepted
    28 April 2023
    Submitted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:25 Jul 2023 08:52
    Last modified:11 Apr 2024 08:55
    URI:https://strathprints.strath.ac.uk/id/eprint/86267
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