Pump-induced stimulated superradiant Smith-Purcell radiation with ultra-narrow linewidth

doi:10.1186/s43593-025-00083-z

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Pump-induced stimulated superradiant Smith-Purcell radiation with ultra-narrow linewidth

eLight Vol. 5, (2025)

Research Article | Updated：2025-07-29

- Pump-induced stimulated superradiant Smith-Purcell radiation with ultra-narrow linewidth
- Affiliations：
- Author bio：
  
  cliu_fang@tsinghua.edu.cn
  myidonghuang@tsinghua.edu.cn
- Funds：
- DOI：10.1186/s43593-025-00083-z
  CLC：
- Received：03 December 2024，
  
  Revised：24 February 2025，
  
  Accepted：03 March 2025，
  
  Published Online：17 April 2025，
  
  Published：2025-12
- Accepted：
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Pump-induced stimulated superradiant Smith-Purcell radiation with ultra-narrow linewidth[J]. Elight, 2025, 5.
DOI：

Pump-induced stimulated superradiant Smith-Purcell radiation with ultra-narrow linewidth[J]. Elight, 2025, 5. DOI： 10.1186/s43593-025-00083-z.

摘要

Abstract

Lasers with the gain medium of gas

liquid

semiconductor

and solid could generate coherent light with rather narrow spectral linewidth

which play an important role in the fields of communication

measurement

sensing

and so on. Although free electron lasers have been realized with their unique advantages

they face challenges in narrowing the spectral linewidth

owing to electron energy fluctuation

Coulomb effect

and other mechanism. Here we demonstrate the superradiant Smith-Purcell radiation (S-SPR) in terahertz frequency band with ultra-narrow and continuously tunable linewidth in a compact device. By proposing a new effect of pump-induced stimulated S-SPR (PIS-SPR)

the spectral linewidth could be reduced to 0.3 kHz @ 291.7 GHz

which is about two–six orders of magnitude narrower compared with those obtained by accelerators and other electron devices. Meanwhile

the wide range of continuously tunable spectral linewidth spanning 0.3–900 kHz is observed for the first time. This work provides a way to greatly narrow the spectral linewidth of free electron radiation and to achieve high-order harmonic of S-SPR in a compact device

and offers a platform to study the interaction between free electron bunches and different micro-&nano-structures.

关键词

Keywords

references

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