Bright compact ultrabroadband source by orthogonal laser-sustained plasma

Zhaojiang Shi; Shichao Yang; He Hu; Haodong Lei; Zhaohua Yang; Xia Yu

doi:10.1038/s41377-024-01602-2

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Bright compact ultrabroadband source by orthogonal laser-sustained plasma

Original Articles

- Bright compact ultrabroadband source by orthogonal laser-sustained plasma
- Light: Science & Applications Vol. 13, Issue 11, Pages: 2756-2766(2024)
- Affiliations：
  
  School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100191, China
- Author bio：
  
  Xia Yu (xiayu@buaa.edu.cn)
- Funds：
- DOI：10.1038/s41377-024-01602-2
  CLC：
- Received：06 February 2024，
  
  Revised：15 August 2024，
  
  Accepted：2024-08-22，
  
  Published Online：26 September 2024，
  
  Published：30 November 2024
- Accepted：
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Shi, Z. J. et al. Bright compact ultrabroadband source by orthogonal laser-sustained plasma. Light: Science & Applications, 13, 2756-2766 (2024).
DOI：

Shi, Z. J. et al. Bright compact ultrabroadband source by orthogonal laser-sustained plasma. Light: Science & Applications, 13, 2756-2766 (2024). DOI： 10.1038/s41377-024-01602-2.

摘要

Abstract

Laser-sustained plasma (LSP) source featuring high brightness and broadband spectral coverage is found to be powerful in various fields of scientific and industrial applications. However

the fundamental limit of low conversion efficiency constrains the system compactness and widespread applications of such broadband light sources. In this paper

we propose an innovative orthogonal LSP to break through the conversion efficiency limitation. Driven by the elevated conversion efficiency from absorbed laser power to ultraviolet (UV) emission

a compact broadband source (250–1650 nm) with UV spectral radiance exceeding 210

$$ {mW}/({{mm}}^{2}\

\cdot\

{sr}\

\cdot\

{nm}) $$

is achieved with

100 W pump laser. With the plot of a two-dimensional refractive index model

we report an important conceptual advance that the orthogonal design eliminates the influence of the negative lensing effect on laser power density. Experimental results unambiguously demonstrate that we achieve a bright compact UV-VIS-NIR source with negligible thermal loss and the highest conversion efficiency to our knowledge. Significant enhancement of 4 dB contrast-to-noise ratio (CNR) in spectral single-pixel imaging has been demonstrated using the proposed ultrabroadband source. By establishing the quantitative link between pumping optics design and plasma absorption

this work presents a compact broadband source that combines superior conversion efficiency and unprecedented brightness

which is essential to high-speed inspection a

nd spectroscopy applications.

关键词

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references

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