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Related Concept Videos

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Related Experiment Video

Updated: Jun 4, 2026

An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
09:49

An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers

Published on: October 23, 2018

Ultrashort ultraviolet free-electron lasers.

D Umstadter1, L H Yu, E Johnson

  • 1Center for Ultrafast Optical Science, University of Michigan, Ann Arbor, Michigan 48109-2099.

Journal of X-Ray Science and Technology
|February 11, 2011
PubMed
Summary
This summary is machine-generated.

This study introduces a novel laser system combining chirped pulse amplification (CPA) with a seeded free-electron laser (FEL) to generate ultra-short, high-energy amplified pulses at unprecedented wavelengths.

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Published on: April 25, 2019

Area of Science:

  • Laser physics
  • Quantum optics
  • Particle accelerators

Background:

  • Chirped pulse amplification (CPA) is a standard technique for generating high-intensity laser pulses.
  • Free-electron lasers (FELs) offer tunability but have limitations in pulse duration and wavelength.
  • Existing tunable laser systems cannot produce amplified pulses of the desired brevity and wavelength.

Purpose of the Study:

  • To develop a novel laser system combining CPA and seeded FEL techniques.
  • To generate amplified pulses with unprecedented brevity and shorter wavelengths than currently achievable.
  • To demonstrate the feasibility of producing 4-fs pulses at 88 nm.

Main Methods:

  • Utilizing a subharmonically seeded FEL to illustrate the concept.
  • Employing optical frequency tripling and stretching of Ti:sapphire laser radiation for seed pulse generation.
  • Modulating electron beam energy with seed radiation and bunching electrons in a dispersion magnet.
  • Amplifying coherent radiation in a wiggler resonant to a harmonic of the seed laser.
  • Optically recompressing the amplified pulses.

Main Results:

  • Generation of 4-femtosecond (fs) pulses with 0.3 millijoule (mJ) energy.
  • Achieved central wavelength of approximately 88 nanometers (nm).
  • Demonstrated preservation of phase coherence during wide bandwidth FEL amplification, enabling pulse compression.

Conclusions:

  • The combined CPA and seeded FEL approach is a viable method for producing ultra-short, high-energy laser pulses at novel wavelengths.
  • This technology surpasses current laser capabilities in terms of pulse duration and wavelength.
  • The developed system has potential applications in various scientific fields requiring extreme ultraviolet (XUV) light sources.