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Hole coupling in free electron lasers

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4 Author(s)
Faatz, B. ; FOM-Inst. voor Plasmafysica ''Rijinhuizen'', Nieuwegein, Netherlands ; Best, R.W.B. ; Oepts, D. ; van Amersfoort, P.W.

Numerical simulations of the performance of a far-infrared free electron laser with an aperture in the upstream cavity mirror are presented. Two different applications of mirror apertures are studied: broadband extraction of radiation and injection of the electron beam. The emphasis is on the effect of the aperture on the amplitude of the higher-order transverse modes. It is shown that the mode distribution at saturation can be greatly influenced by variation of the mirror radius of curvature. A simple formula which is quite useful for predicting the dominant higher-order modes is derived. This permits optimization of the cavity with respect to the application in question

Published in:

Quantum Electronics, IEEE Journal of  (Volume:29 ,  Issue: 7 )

Date of Publication:

Jul 1993

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