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Related Experiment Videos

First ultraviolet high-gain harmonic-generation free-electron laser.

L H Yu1, L DiMauro, A Doyuran

  • 1National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973, USA. lhyu@bnl.gov

Physical Review Letters
|August 26, 2003
PubMed
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This study presents the first experimental results of a high-gain harmonic-generation (HGHG) free-electron laser (FEL) in the ultraviolet spectrum. The HGHG FEL successfully generated saturated 266 nm radiation using an 800 nm seed laser.

Area of Science:

  • Physics
  • Laser Science
  • Quantum Electronics

Background:

  • Free-electron lasers (FELs) are powerful sources of tunable coherent radiation.
  • High-gain harmonic-generation (HGHG) is a technique to produce FEL radiation at shorter wavelengths.
  • Operating FELs in the ultraviolet (UV) range presents unique challenges and opportunities.

Purpose of the Study:

  • To report the first experimental demonstration of a high-gain harmonic-generation free-electron laser (HGHG FEL) operating in the ultraviolet.
  • To validate theoretical predictions for HGHG FEL performance at UV wavelengths.
  • To characterize the output radiation properties of the UV HGHG FEL.

Main Methods:

  • Utilized an 800 nm seed laser derived from a Ti:sapphire laser.

Related Experiment Videos

  • Employed the high-gain harmonic-generation (HGHG) mechanism within a free-electron laser (FEL) setup.
  • Operated the FEL to produce third-harmonic radiation at 266 nm.

    • Main Results:

    • Achieved saturated amplified radiation at 266 nm (third harmonic).
    • Confirmed stable central wavelength of the generated UV radiation.
    • Observed narrow bandwidth and small pulse-energy fluctuations in the output.

    Conclusions:

    • The experimental results validate the feasibility and performance predictions of HGHG FELs in the ultraviolet.
    • The demonstrated UV HGHG FEL offers a stable, narrow-bandwidth, and low-fluctuation radiation source.
    • This work paves the way for advanced applications requiring coherent UV radiation from FELs.