Observation of superradiance in a short-pulse fel oscillator

D.A. Jaroszynski, P. Chaix, N. Piovella, D. Oepts, G.M.H. Knippels, A.F.G. vanderMeer, H.H. Weits

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Superradiance has been experimentally studied, in a short-pulse free-electron laser (FEL) oscillator. Superradiance is the optimal way of extracting optical radiation from an FEL and can be characterised by the following scale laws: peak optical power P, scales as the square of electron charge, Q, (P, &unknown; Q2); the optical pulse duration, z, scales as the inverse of the square root of the charge, (z &unknown; 1/Q); the efficiency, , scales as the inverse of optical pulse length ( &unknown; 1/z &unknown; Q), which also implies that the relative spectral brightness defined by /(/) remains constant and close to 0.86. To characterise the properties of the superradiant emission, we have measured the efficiency, optical pulse energy, pulse duration and spectral width as functions of electron beam current and cavity loss for the optimum cavity length detuning. The efficiency has been deduced from measurements of electron beam energy spectra. The optical pulse duration has been determined from second-order autocorrelation measurements and the optical spectra determined using a grating spectrometer. We show that the superradiance in the oscillator has properties similar to that in a high-gain amplifier and discuss the links with spikes created by synchrotron instabilities.
LanguageEnglish
Pages332-338
Number of pages6
JournalNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume393
Issue number1
DOIs
Publication statusPublished - 1 Jul 1997

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Superradiance
Pulse generators
Laser pulses
oscillators
pulse duration
pulses
free electron lasers
Free electron lasers
electron beams
cavities
Electron beams
high gain
beam currents
spikes
autocorrelation
optical spectrum
synchrotrons
brightness
energy spectra
amplifiers

Keywords

  • superradiance
  • free-electron lasers
  • ultra-short optical pulsed

Cite this

Jaroszynski, D.A. ; Chaix, P. ; Piovella, N. ; Oepts, D. ; Knippels, G.M.H. ; vanderMeer, A.F.G. ; Weits, H.H. / Observation of superradiance in a short-pulse fel oscillator. In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 1997 ; Vol. 393, No. 1. pp. 332-338.
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Observation of superradiance in a short-pulse fel oscillator. / Jaroszynski, D.A.; Chaix, P.; Piovella, N.; Oepts, D.; Knippels, G.M.H.; vanderMeer, A.F.G.; Weits, H.H.

In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 393, No. 1, 01.07.1997, p. 332-338.

Research output: Contribution to journalArticle

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AU - Jaroszynski, D.A.

AU - Chaix, P.

AU - Piovella, N.

AU - Oepts, D.

AU - Knippels, G.M.H.

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N2 - Superradiance has been experimentally studied, in a short-pulse free-electron laser (FEL) oscillator. Superradiance is the optimal way of extracting optical radiation from an FEL and can be characterised by the following scale laws: peak optical power P, scales as the square of electron charge, Q, (P, &unknown; Q2); the optical pulse duration, z, scales as the inverse of the square root of the charge, (z &unknown; 1/Q); the efficiency, , scales as the inverse of optical pulse length ( &unknown; 1/z &unknown; Q), which also implies that the relative spectral brightness defined by /(/) remains constant and close to 0.86. To characterise the properties of the superradiant emission, we have measured the efficiency, optical pulse energy, pulse duration and spectral width as functions of electron beam current and cavity loss for the optimum cavity length detuning. The efficiency has been deduced from measurements of electron beam energy spectra. The optical pulse duration has been determined from second-order autocorrelation measurements and the optical spectra determined using a grating spectrometer. We show that the superradiance in the oscillator has properties similar to that in a high-gain amplifier and discuss the links with spikes created by synchrotron instabilities.

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