Phonon engineering in Yb: La2CaB10O19 crystal for extended lasing beyond the fluorescence spectrum

Yanling Cheng; Fei Liang; Dazhi Lu; Jingcheng Feng; Guochun Zhang; Haohai Yu; Huaijin Zhang; Yicheng Wu

doi:10.1038/s41377-023-01243-x

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Phonon engineering in Yb: La₂CaB₁₀O₁₉ crystal for extended lasing beyond the fluorescence spectrum

Original Articles

- Phonon engineering in Yb: La₂CaB₁₀O₁₉ crystal for extended lasing beyond the fluorescence spectrum
- Light: Science & Applications Vol. 12, Issue 9, Pages: 1921-1929(2023)
- Affiliations：
  
  1.State Key Laboratory of Crystal Materials and Institute of Crystal Materials, Shandong University, Jinan 250100, China
  2.Key Lab Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- Author bio：
  
  Fei Liang (liangfei@sdu.edu.cn)
  Haohai Yu (haohaiyu@sdu.edu.cn)
  Huaijin Zhang (huaijinzhang@sdu.edu.cn)
- Funds：
- DOI：10.1038/s41377-023-01243-x
  CLC：
- Published：30 September 2023，
  
  Published Online：25 August 2023，
  
  Received：16 March 2023，
  
  Revised：17 July 2023，
  
  Accepted：23 July 2023
- Accepted：
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Cheng, Y. L. et al. Phonon engineering in Yb: La₂CaB₁₀O₁₉ crystal for extended lasing beyond the fluorescence spectrum. Light: Science & Applications, 12, 1921-1929 (2023).
DOI：

Cheng, Y. L. et al. Phonon engineering in Yb: La₂CaB₁₀O₁₉ crystal for extended lasing beyond the fluorescence spectrum. Light: Science & Applications, 12, 1921-1929 (2023). DOI： 10.1038/s41377-023-01243-x.

摘要

Abstract

Since the first invention of the laser in 1960

direct lasing outside the fluorescence spectrum is deemed impossible owing to the "zero-gain" cross-section. However

when electron-phonon coupling meets laser oscillation

an energy modulation by the quantized phonon can tailor the electronic transitions

thus directly creating some unprecedented lasers with extended wavelengths by phonon engineering. Here

we demonstrate a broadband lasing (1000–1280 nm) in a Yb-doped La

CaB

(Yb: LCB) crystal

far beyond its spontaneous fluorescence spectrum. Numerical calculations and in situ Raman verify that such a substantial laser emission is devoted to the multiphonon coupling to lattice vibrations of a dangling "quasi-free-oxygen" site

with the increasing ph

onon numbers step-by-step (

= 1–6). This new structural motif provides more alternative candidates with strong-coupling laser materials. Moreover

the quantitative relations between phonon density distribution and laser wavelength extension are discussed. These results give rise to the search for on-demand lasers in the darkness and pave a reliable guideline to study those intriguing electron-phonon-photon coupled systems for integrated photonic applications.

关键词

Keywords

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