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    Researchers develop compact superradiant Smith-Purcell device with ultra-narrow linewidth

    April 23, 2025, Categories  Physics

    Pump-induced stimulated superradiant smith-purcell radiation with ultra-narrow linewidth
    A schematic view of the pump-induced stimulated superradiant Smith-Purcell radiation (PIS-SPR) device, which consists of the electron pre-bunching, electron-compression and harmonic-emission section. Based on PIS-SPR, the free electron beam is well bunched and ultra-narrow spectral linewidth at THz frequency region has been observed. Credit: eLight (2025). DOI: 10.1186/s43593-025-00083-z

    Superradiant Smith-Purcell radiation (S-SPR) is a kind of free electron radiation with a train of free electron bunches passing over a periodic grating. In theory, the ultra-narrow spectral linewidth of S-SPR could be realized which would be greatly beneficial to various applications such as imaging, sensing and communication.

    However, in the free electron accelerators, customized setups and orotr...

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