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High-gain harmonic generation free-electron laser with variable wavelength.

Timur Shaftan1, Li Hua Yu

  • 1National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|May 21, 2005
PubMed
Summary

This study presents a new method for tunable high-gain harmonic generation (HGHG) free-electron lasers (FELs). By tuning the accelerator instead of the seed, researchers achieved a +/-10% wavelength variation in the deep ultraviolet FEL.

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Area of Science:

  • Physics
  • Laser Technology
  • Accelerator Physics

Background:

  • The wavelength of high-gain harmonic generation (HGHG) free-electron lasers (FELs) is typically determined by the tunable external seed.
  • This dependence necessitates a tunable seed for achieving wavelength variations in the output radiation.

Purpose of the Study:

  • To propose and investigate an alternative scheme for tunable HGHG FELs.
  • To demonstrate wavelength tunability by adjusting the accelerator parameters rather than the seed wavelength.

Main Methods:

  • A novel HGHG FEL scheme was developed where the external seed wavelength remains fixed.
  • Accelerator tuning was employed as the primary mechanism for achieving output radiation wavelength variations.
  • The proposed scheme was applied to the deep ultraviolet FEL (DUV FEL) at Brookhaven National Laboratory for validation.

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Main Results:

  • The study successfully demonstrated wavelength variability in the HGHG FEL by tuning the accelerator.
  • A wavelength tuning range of approximately +/-10% was achieved with the fixed seed configuration.
  • The application to the DUV FEL confirmed the feasibility and effectiveness of the proposed method.

Conclusions:

  • The proposed accelerator-tuning scheme offers a viable alternative for achieving wavelength tunability in HGHG FELs.
  • This method decouples the seed wavelength from the output radiation wavelength, simplifying laser design and operation.
  • The demonstrated +/-10% tuning range highlights the practical potential of this approach for scientific applications.