Title :
Hole coupling in free electron lasers
Author :
Faatz, B. ; Best, R.W.B. ; Oepts, D. ; van Amersfoort, P.W.
Author_Institution :
FOM-Inst. voor Plasmafysica ´´Rijinhuizen´´, Nieuwegein, Netherlands
fDate :
7/1/1993 12:00:00 AM
Abstract :
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
Keywords :
free electron lasers; laser accessories; laser cavity resonators; laser modes; laser theory; mirrors; optimisation; broadband extraction; dominant higher-order modes; electron beam injection; far-infrared; free electron lasers; higher-order transverse modes; mirror apertures; mirror radius of curvature; mode distribution; optimization; radiation extraction; saturation; upstream cavity mirror; Apertures; Charge carrier processes; Dielectrics; Electron beams; Free electron lasers; Laser modes; Mirrors; Optical coupling; Optical resonators; Undulators;
Journal_Title :
Quantum Electronics, IEEE Journal of
