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Related Experiment Video

Updated: Jan 21, 2026

Endoscopy Guided Photoablation of Endometrial Cysts using a 980 nm Laser with a Contact Fiber in Mares

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Published on: July 16, 2020

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

Lihong Hong^1,2,3, Renyu Feng², Yuanyuan Liu¹

¹School of Physics and Optoelectronics, South China University of Technology, Guangzhou, 510641, China.

Light, Science & Applications

|January 19, 2026

Summary

Researchers developed an intense ultrafast white laser spanning deep-ultraviolet to far-infrared wavelengths. This novel laser enables full-spectrum spectroscopy for diverse scientific and technological applications.

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Area of Science:

Laser Physics
Spectroscopy
Nonlinear Optics

Background:

Ultrafast laser technology is crucial for advanced spectroscopy.
Broadband laser sources are needed for comprehensive material analysis.
Current limitations exist in achieving continuous spectral coverage from DUV to FIR.

Purpose of the Study:

To create an intense ultrafast white laser with continuous spectral coverage from deep-ultraviolet (DUV) to far-infrared (FIR).
To demonstrate the laser's capability for full-spectrum laser spectroscopy.
To explore applications in basic science and technology.

Main Methods:

Utilized synergic nonlinear up-conversion and down-conversion modules.
Employed a mid-infrared (MIR) seed pulse laser generated via optical-parametric chirped pulse amplification and krypton gas-filled hollow-core fiber.
Designed a chirped-periodic poling lithium niobate (CPPLN) crystal for second-order nonlinear harmonic generation and AgGaSe2 crystals for difference-frequency generation.

Main Results:

Achieved an intense white laser with 200-25,000 nm bandwidth and ~1 mJ pulse energy.
Generated DUV wavelengths down to 200 nm with ~40% conversion efficiency.
Produced MIR-FIR laser wavelengths from 2000-25,000 nm with an overall 18% conversion efficiency.

Conclusions:

The developed 7-octave ultraflat DUV-FIR white laser provides unprecedented power for simultaneous probing of electronic, vibrational, and lattice dynamics.
This technology opens new avenues for full-spectrum laser spectroscopy.
Potential applications span a wide range of physical, chemical, and biological substances and processes.