skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

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

Abstract

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. The authors 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.

Authors:
; ;  [1];  [2]
  1. FOM Inst. for Plasma Physics Rijnhuizen, Nieuwegein (Netherlands)
  2. Commissariat a l`Energie Atomique, Bruyeres-le-Chatel (France). Service de Physique et Techniques Nucleaires
Publication Date:
OSTI Identifier:
253677
Resource Type:
Journal Article
Journal Name:
IEEE Journal of Quantum Electronics
Additional Journal Information:
Journal Volume: 32; Journal Issue: 6; Other Information: PBD: Jun 1996
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; FREE ELECTRON LASERS; WIGGLER MAGNETS; BEAM SHAPING; LASER CAVITIES; ELECTROMAGNETIC PULSES; MAGNETIC FIELDS

Citation Formats

Knippels, G M.H., Meer, A.F.G. van der, Mols, R.F.X.A.M., Oepts, D, Amersfoort, P.W. van, and Jaroszynski, D A. Influence of a step-tapered undulator field on the optical pulse shape of a far-infrared free electron laser. United States: N. p., 1996. Web. doi:10.1109/3.502366.
Knippels, G M.H., Meer, A.F.G. van der, Mols, R.F.X.A.M., Oepts, D, Amersfoort, P.W. van, & Jaroszynski, D A. Influence of a step-tapered undulator field on the optical pulse shape of a far-infrared free electron laser. United States. https://doi.org/10.1109/3.502366
Knippels, G M.H., Meer, A.F.G. van der, Mols, R.F.X.A.M., Oepts, D, Amersfoort, P.W. van, and Jaroszynski, D A. Sat . "Influence of a step-tapered undulator field on the optical pulse shape of a far-infrared free electron laser". United States. https://doi.org/10.1109/3.502366.
@article{osti_253677,
title = {Influence of a step-tapered undulator field on the optical pulse shape of a far-infrared free electron laser},
author = {Knippels, G M.H. and Meer, A.F.G. van der and Mols, R.F.X.A.M. and Oepts, D and Amersfoort, P.W. van and Jaroszynski, D A},
abstractNote = {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. The authors 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.},
doi = {10.1109/3.502366},
url = {https://www.osti.gov/biblio/253677}, journal = {IEEE Journal of Quantum Electronics},
number = 6,
volume = 32,
place = {United States},
year = {1996},
month = {6}
}