Influence of a step-tapered undulator field on the optical pulse shape of a far-infrared free-electron laser

The optical output of the free-electron laser for infrared experiments (FELIX), which operates in the regime of strong slippage, consists of picosecond pulses. Depending on the amount of cavity desynchronization, the optical pulse can develop substantial structure in the form of multiple subpulses....

Full description

Saved in:
Bibliographic Details
Published in:IEEE journal of quantum electronics 1996-06, Vol.32 (6), p.896-904
Main Authors: Knippels, G.M.H., van de Meer, A.F.G., Mols, R.F.X.A.M., Oepts, D., van Amersfoort, P.W., Jaroszynski, D.A.
Format: Article
Language:English
Subjects:
Autocorrelation
Electromagnetism
electron and ion optics
Electron optics
Exact sciences and technology
Free electron lasers
Fundamental areas of phenomenology (including applications)
Optical pulse shaping
Optical pulses
Optical saturation
Physics
Pulse measurements
Radiation by moving charges
Shape measurement
Undulators
Wavelength measurement
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The optical output of the free-electron laser for infrared experiments (FELIX), which operates in the regime of strong slippage, consists of picosecond pulses. Depending on the amount of cavity desynchronization, the optical pulse can develop substantial structure in the form of multiple subpulses. We present second-order autocorrelation measurements of the subpulses at several far-infrared wavelengths while applying a step-taper in the undulator field. The operation with a step-tapered undulator prevents the electrons from reabsorbing the optical field energy, leading to a smooth optical pulse. For different settings of the undulator the measured pulse shape and corresponding power spectrum are discussed. It is possible without decreasing the small-signal gain to produce a smooth high-power optical pulse during the whole saturated part of the machine pulse in an FEL oscillator with a reverse-step tapered undulator.
ISSN:0018-9197
1558-1713
DOI:10.1109/3.502366