Thresholdless coherence in a superradiant laser

Seung-Hoon Oh; Jinuk Kim; Junseo Ha; Gibeom Son; Kyungwon An

doi:10.1038/s41377-024-01591-2

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Thresholdless coherence in a superradiant laser

Original Articles

- Thresholdless coherence in a superradiant laser
- Light: Science & Applications Vol. 13, Issue 11, Pages: 2549-2555(2024)
- Affiliations：
  
  1.Department of Physics and Astronomy & Institute of Applied Physics, Seoul National University, Seoul, Korea
  2.Korea Research Institute of Standards and Science, Daejeon, Korea
- Author bio：
  
  Kyungwon An (kwan@phya.snu.ac.kr)
- Funds：
- DOI：10.1038/s41377-024-01591-2
  CLC：
- Received：18 March 2024，
  
  Revised：14 August 2024，
  
  Accepted：2024-08-19，
  
  Published Online：05 September 2024，
  
  Published：30 November 2024
- Accepted：
Scan QR Code
Oh, S. H. et al. Thresholdless coherence in a superradiant laser. Light: Science & Applications, 13, 2549-2555 (2024).
DOI：

Oh, S. H. et al. Thresholdless coherence in a superradiant laser. Light: Science & Applications, 13, 2549-2555 (2024). DOI： 10.1038/s41377-024-01591-2.

摘要

Abstract

Lasing threshold in the conventional lasers is the minimum input power required to initiate laser oscillation. It has been widely accepted that the conventional laser threshold occurring around a unity intracavity photon number can be eliminated in the input-output curve by making the so-called

parameter approach unity. The recent experiments

however

have revealed that even in this case the photon statistics still undergo a transition from coherent to thermal statistics when the intracavity mean photon number is decreased below unity. Since the coherent output is only available above the diminished threshold

the long-sought promise of thresholdless lasers to produce always coherent light has become questionable. Here

we present an always-coherent thresholdless laser based on superradiance by two-level atoms in a quantum superposition state with the same phase traversing a high-Q cavity. Superradiant lasing was observed without the conventional lasing threshold around the unity photon number and the photon statistics remained near coherent even below it. The coherence was improved by reducing the coupling constant as well as the excited-state amplitude in the superposition state. Our results pave a way toward always-coherent thresholdless lasers with more practical media such as quantum dots

nitrogen-vacancy centers and doped ions in crystals.

关键词

Keywords

references

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