Free Electron Laser (Oscillator) - Linear Gain And Stable Pulse Propagation

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Abstract
The operation of a Free Electron Laser (FEL) in an oscillator mode using a variable parameter wiggler has been investigated by a combination of theoretical analysis and numerical simulation. The linear eigenmode analysis leading to a calculation of the linear gain per pass has been carried out for both ultra-short and finite length micropulses. The effects of sideband growth and suppression are studied using a simulation code. Stable large amplitude pulse propagation is achieved by passing the pulse through a band-pass filter to attenuate sideband modes above and below the main pulse frequency. A minimum current criterion is derived which must be satisfied to ensure both linear gain and stable pulse propagation.© (1984) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.