First Operation of a Storage-Ring Free-Electron Laser

Billardon, M.; Elleaume, P.; Ortéga, J.M.; Bazin, C.; Bergher, M.; Velghe, M.; Pétroff, Y.; Deacon, D. A. G.; Robinson, K.; Madey, J. M. J.

doi:10.1103/physrevlett.51.1652

Cited by 266 publications

(39 citation statements)

References 8 publications

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“…Power levels from hundreds of megawatts to gigawatts have been produced in the infrared (Deacon et al, 1977;Newman et al, 1985) to microwave wavelength range (Parker et al, 1982;Orzechowski et al, 1985Orzechowski et al, , 1986). In addition, free electron lasers are capable of producing coherent radiation in the visible wavelength range (Billardon et al, 1983) and even at shorter wavelengths. An important parameter characterizing free electron laser operation is the small-signal gain (growth rate).…”

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confidence: 99%

Chaotic particle dynamics in free-electron lasers

Chen

Davidson

1991

Phys. Rev. A

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The motion of a relativistic test electron in a free electron laser can be altered significantly by the equilibrium self-field effects produced by the beam space charge and current and by the transverse spatial inhomogeneities in a realizable magnetic wiggler field. In a field configuration consisting of an ideal (constant-amplitude) helical wiggler field and a uniform axial guide field, it is shown that the inclusion of self-field effects destroys the integrability of the particle equations of motion. Consequently, the Group-I orbits and the Group-II orbits become chaotic at sufficiently high beam density. An analytical estimate of the threshold value of the self-field parameter F, = wg/ckw for the onset of chaoticity is obtained and found to be in good agreement with computer simulations. In addition, the effects of transverse spatial gradients in a realizable helical wiggler field with three-dimensional spatial variations are investigated in the absence of an axial guide field, but including self-field effects. For a thin electron beam (k 2r2 < 1) and small wiggler field amplitude (a, < yb 2 ), it is shown that the motion is regular and confined radially provided E, < ybaw/(1 + al). However, because of the intrinsic nonintegrability of the motion, the regular region in phase space diminishes in size as the wiggler amplitude is increased. The threshold value of the wiggler amplitude for the onset of chaoticity is estimated analytically and confirmed by computer simulations for the special case where self-field effects are negligibly small. Moreover, it is shown that the particle motion becomes chaotic on a time scale comparable with the beam transit time through one wiggler period.

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confidence: 99%

Chaotic particle dynamics in free-electron lasers

Chen

Davidson

1991

Phys. Rev. A

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“…[10][11][12]). Really, the first true laser operations [13] in the infrared, at ~3.4m and in the visible [14] at wavelength ~0.65m could be satisfactorly described in the framework of the cassical theory. From the conceptual point of view, this has been in good accord with an earlier analysis of Borenstein and Lamb on the "classical laser" [15].…”

Section: Introductionmentioning

confidence: 99%

Interference Phenomena and Whispering-Gallery Modes of Synchrotron Radiation in a Cylindrical Wave-Guide

Varró¹

2012

Free Electron Lasers

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“…Free-electron lasers (FELs) are coherent light sources based on the interaction between relativistic electron bunches and a spatially periodic magnetic field [1,2]. They emit femtosecond/picosecond laser pulses synchronized with the electron bunches.…”

Section: Introductionmentioning

confidence: 99%

“…Assuming perfect alignment, the fraction of power reinjected by the feedback into the laser mode (from inside to inside) is 2 …”

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confidence: 99%

Suppression of self-pulsing instabilities in free-electron lasers using delayed optical feedback

Évain

Szwaj

Bielawski

et al. 2012

Phys. Rev. ST Accel. Beams

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We show that the macropulse instability affecting storage ring free-electron laser (FEL) oscillators can be suppressed using a delayed optical feedback. The principle, known as coherent photon seeding, consists in reinjecting a very small part of the laser output in the laser cavity in order to create a new deterministic solution. The feedback is shown to be efficient over a large range of the detuning parameter of the FEL cavity, even with very small fractions of reinjected power (< 10 À8 here from inside to inside the cavity). The experiments have been performed on the UVSOR-II storage ring free-electron laser.

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First Operation of a Storage-Ring Free-Electron Laser

Abstract: A storage-ring free-electron laser oscillator has been operated above threshold at a visible wavelength X^ 6500 A.

Cited by 266 publications

References 8 publications

Chaotic particle dynamics in free-electron lasers

Chaotic particle dynamics in free-electron lasers

Interference Phenomena and Whispering-Gallery Modes of Synchrotron Radiation in a Cylindrical Wave-Guide

Suppression of self-pulsing instabilities in free-electron lasers using delayed optical feedback

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