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Related Experiment Video

Updated: May 14, 2026

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

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Published on: August 5, 2013

Free-electron lasing at 27 nanometres based on a laser wakefield accelerator.

Wentao Wang¹, Ke Feng², Lintong Ke^2,3

¹State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-intense Laser Science, Shanghai Institute of Optics and Fine Mechanics (SIOM), Chinese Academy of Sciences (CAS), Shanghai, People's Republic of China. wwt1980@siom.ac.cn.

|July 22, 2021

Summary

Researchers demonstrated compact X-ray free-electron laser (XFEL) technology using laser wakefield accelerators. This breakthrough enables powerful, smaller, and more affordable X-ray sources for scientific research.

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Last Updated: May 14, 2026

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Published on: October 23, 2018

Area of Science:

Physics
Accelerator Science
Photon Science

Background:

X-ray free-electron lasers (XFELs) provide intense, coherent radiation crucial for structural biology and chemistry.
Current XFEL facilities rely on large, costly radio-frequency accelerators.
Compact and economical accelerator options are highly sought after.

Purpose of the Study:

To demonstrate the feasibility of using laser wakefield accelerators (LWAs) for XFEL applications.
To overcome the challenge of poor electron beam quality from LWAs for lasing.
To achieve exponential gain in undulator radiation using LWA-driven electron beams.

Main Methods:

Experimental setup utilizing three undulators.
Generation of electron beams via laser wakefield acceleration.
Measurement of amplified undulator radiation characteristics.

Main Results:

Successful experimental demonstration of undulator radiation amplification in the exponential-gain regime.
Achieved peak radiation energy of approximately 150 nanojoules at 27 nm.
Observed a 100-fold power gain in the third undulator, confirming lasing.

Conclusions:

Proof-of-principle for free-electron lasing using laser wakefield accelerators.
Paves the way for developing compact and economical XFELs.
Broadens potential applications of XFEL technology through miniaturization.