Frequency modulated free electron laser

L. T. Campbell, B. W. J. McNeil

Research output: Contribution to journalLetter

Abstract

It is shown that the output frequency of a free electron laser may be modulated to generate a series of modes that span a bandwidth of at least an order of magnitude greater than the normal FEL bandwidth. This new method of frequency modulated FEL operation has close analogies to frequency modulation in conventional cavity lasers. The FM-FEL is analysed and described in the linear regime by a summation over the exponentially amplified frequency modes.
Simulations using a 3D, broad bandwidth, numerical code also demonstrate FM-FEL operation for parameters typical of FEL facilities currently under construction. Harmonic bunching methods are used to seed the FM-FEL modes to generate a temporally correlated frequency modulated output over a large bandwidth. This new, FM-FEL mode of operation scales well for X-ray generation, offering users a significantly new form of high-power, short wavelength FEL output.
LanguageEnglish
Pages8792-8799
Number of pages8
JournalOptics Express
Volume27
Issue number6
DOIs
Publication statusPublished - 18 Mar 2019

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free electron lasers
frequency modulation
bandwidth
output
bunching
laser cavities
seeds
harmonics
wavelengths
x rays
simulation

Keywords

  • electric fields
  • free electron lasers
  • frequency modulated lasers

Cite this

Campbell, L. T. ; McNeil, B. W. J. / Frequency modulated free electron laser. In: Optics Express. 2019 ; Vol. 27, No. 6. pp. 8792-8799.
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Frequency modulated free electron laser. / Campbell, L. T.; McNeil, B. W. J.

In: Optics Express, Vol. 27, No. 6, 18.03.2019, p. 8792-8799.

Research output: Contribution to journalLetter

TY - JOUR

T1 - Frequency modulated free electron laser

AU - Campbell, L. T.

AU - McNeil, B. W. J.

N1 - Has been highlighted as an Editor's Pick. Editor's Picks serve to highlight articles with excellent scientific quality and are representative of the work taking place in a specific field.

PY - 2019/3/18

Y1 - 2019/3/18

N2 - It is shown that the output frequency of a free electron laser may be modulated to generate a series of modes that span a bandwidth of at least an order of magnitude greater than the normal FEL bandwidth. This new method of frequency modulated FEL operation has close analogies to frequency modulation in conventional cavity lasers. The FM-FEL is analysed and described in the linear regime by a summation over the exponentially amplified frequency modes.Simulations using a 3D, broad bandwidth, numerical code also demonstrate FM-FEL operation for parameters typical of FEL facilities currently under construction. Harmonic bunching methods are used to seed the FM-FEL modes to generate a temporally correlated frequency modulated output over a large bandwidth. This new, FM-FEL mode of operation scales well for X-ray generation, offering users a significantly new form of high-power, short wavelength FEL output.

AB - It is shown that the output frequency of a free electron laser may be modulated to generate a series of modes that span a bandwidth of at least an order of magnitude greater than the normal FEL bandwidth. This new method of frequency modulated FEL operation has close analogies to frequency modulation in conventional cavity lasers. The FM-FEL is analysed and described in the linear regime by a summation over the exponentially amplified frequency modes.Simulations using a 3D, broad bandwidth, numerical code also demonstrate FM-FEL operation for parameters typical of FEL facilities currently under construction. Harmonic bunching methods are used to seed the FM-FEL modes to generate a temporally correlated frequency modulated output over a large bandwidth. This new, FM-FEL mode of operation scales well for X-ray generation, offering users a significantly new form of high-power, short wavelength FEL output.

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KW - free electron lasers

KW - frequency modulated lasers

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