mJ-level 7-octave ultraflat white laser encompassing 200–25,000 nm

Lihong Hong; Renyu Feng; Yuanyuan Liu; Junming Liu; Junyu Qian; Yujie Peng; Yuxin Leng; Ruxin Li; Zhi-Yuan Li

doi:10.1038/s41377-025-02142-z

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mJ-level 7-octave ultraflat white laser encompassing 200–25,000 nm

Original Articles

- mJ-level 7-octave ultraflat white laser encompassing 200–25,000 nm
- Light: Science & Applications Vol. 15, Issue 3, Pages: 858-871(2026)
- Affiliations：
  
  1.School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510641, China
  2.State Key Laboratory of Ultra-intense Laser Science and Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
  3.Guangdong Jingqi Laser Technology Corporation Limited, Dongguan 523808, China
  4.State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China
- Author bio：
  
  Ruxin Li (ruxinli@mail.shcnc.ac.cn)
  Zhi-Yuan Li (phzyli@scut.edu.cn)
- Funds：
- DOI：10.1038/s41377-025-02142-z
  CLC：
- Received：24 September 2025，
  
  Revised：2025-11-11，
  
  Accepted：17 November 2025，
  
  Online First：20 January 2026，
  
  Published：31 March 2026
- Accepted：
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Hong, L. H. et al. mJ-level 7-octave ultraflat white laser encompassing 200–25,000 nm. Light: Science & Applications, 15, 858-871 (2026).
DOI：

Hong, L. H. et al. mJ-level 7-octave ultraflat white laser encompassing 200–25,000 nm. Light: Science & Applications, 15, 858-871 (2026). DOI： 10.1038/s41377-025-02142-z.

摘要

Abstract

An intense ultrafast pulse white laser with continuous and ultraflat spectral coverage from deep-ultraviolet (DUV) to far-infrared (FIR) can open up a new arena of full-spectrum laser spectroscopy with applications to a wide variety of basic science and technology areas. Here

we present the creation of an intense white laser with 200–25

000 nm bandwidth @17 dB and ~1 mJ pulse energy by exploiting the synergic action of a high-efficiency nonlinear up-conversion module and down-conversion module upon an intense mid-infrared (MIR) seed pulse laser. The MIR seed pulse laser of 3.62 mJ pulse energy is achieved by sending an optical-parametric chirped pulse amplification pulse laser of 7.12 mJ pulse energy and 3.9 µm central wavelength through a krypton gas-filled hollow-core fiber. The up-conversion nonlinear module is a deliberately designed chirped-periodic poling lithium niobate (CPPLN) nonlinear crystal supporting simultaneous broadband second-order nonlinear 2nd–12th harmonic generation upon the seed laser to generate the shortest DUV wavelength down to 200 nm with a nearly 40% conversion efficiency. The down-conversion nonlinear module is composed of a bare LN crystal offering third-order nonlinear spectral broadening effect and a cascaded AgGaSe

nonlinear crystal offering high-efficiency intra-pulse difference-frequency generation

and generates a 2000–25

000 nm MIR-FIR laser with an overall conversion efficiency of 18%. The intense 7-octave ultraflat DUV-FIR white laser would offer an unprecedented power to simultaneously probe and monitor the electronic transition

molecular vibration

and lattice oscillation in a wide variety of physical

chemical

and biological substances and processes.

关键词

Keywords

references

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