Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 332-338 |
| Number of pages | 6 |
| Journal | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment |
| Volume | 393 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 1 Jul 1997 |
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Keywords
- superradiance
- free-electron lasers
- ultra-short optical pulsed
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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 journal › Article
TY - JOUR
T1 - Observation of superradiance in a short-pulse fel oscillator
AU - Jaroszynski, D.A.
AU - Chaix, P.
AU - Piovella, N.
AU - Oepts, D.
AU - Knippels, G.M.H.
AU - vanderMeer, A.F.G.
AU - Weits, H.H.
PY - 1997/7/1
Y1 - 1997/7/1
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.
AB - 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.
KW - superradiance
KW - free-electron lasers
KW - ultra-short optical pulsed
UR - http://dx.doi.org/10.1016/S0168-9002(97)80373-7
U2 - 10.1016/S0168-9002(97)80373-7
DO - 10.1016/S0168-9002(97)80373-7
M3 - Article
VL - 393
SP - 332
EP - 338
JO - Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
SN - 0168-9002
IS - 1
ER -