Frequency modulated free electron laser

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

doi:10.1364/OE.27.008792

Frequency modulated free electron laser

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

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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.

Original language	English
Pages (from-to)	8792-8799
Number of pages	8
Journal	Optics Express
Volume	27
Issue number	6
DOIs	https://doi.org/10.1364/OE.27.008792
Publication status	Published - 18 Mar 2019

Keywords

electric fields
free electron lasers
frequency modulated lasers

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Brian McNeil
- b.w.j.mcneil@strath.ac.uk
- Physics - Reader
- SUPA
Person: Academic

1 Active
2 Finished

STFC MoA 4132361: Free Electron Lasers and Advanced Light Sources
McNeil, B.
STFC Science and Technology Facilities Council
1/04/11 → 31/03/21
Project: Research
Simulations for Future X-ray Free electron Lasers
McNeil, B.
EPSRC (Engineering and Physical Sciences Research Council)
1/02/15 → 31/01/17
Project: Research
E Infrastructure Bid - Capital Equipment Bid
Littlejohn, D., Fedorov, M., Mulheran, P. & Reese, J.
EPSRC (Engineering and Physical Sciences Research Council)
20/01/12 → 31/03/12
Project: Research

Cite this

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title = "Frequency modulated free electron laser",

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.",

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doi = "10.1364/OE.27.008792",

language = "English",

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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.

KW - electric fields

KW - free electron lasers

KW - frequency modulated lasers

UR - https://www.osapublishing.org/oe/home.cfm

U2 - 10.1364/OE.27.008792

DO - 10.1364/OE.27.008792

M3 - Letter

VL - 27

SP - 8792

EP - 8799

JO - Optics Express

JF - Optics Express

SN - 1094-4087

IS - 6

ER -

Frequency modulated free electron laser

Abstract

Keywords

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Brian McNeil

STFC MoA 4132361: Free Electron Lasers and Advanced Light Sources

Simulations for Future X-ray Free electron Lasers

E Infrastructure Bid - Capital Equipment Bid

Cite this