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1 November 1997 Initial results of the infrared regenerative amplifier free-electron laser experiment
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The Regenerative Amplifier Free-Electron Laser is a new FEL approach aimed at achieving the highest optical power from a compact RL-linac FEL. The key idea is to re-inject a small fraction of the optical power into a high-gain wiggler to enable the FEL to reach saturation in a few passes. The use of large outcoupling increases the FEL output efficiency and reduces the risk of optical damage to the feedback mirrors. This paper summarizes the design of the high-power IR regenerative amplifier FEL and describes the initial experimental results. The highest optical energy achieved thus far at 15.5 micrometers is 0.5 J over a train of 1000 micropulses. We infer a pulse energy of 0.5 mJ in each 10 ps micropulse, corresponding to a peak power of 50 MW.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Dinh C. Nguyen, Richard L. Sheffield, Clifford M. Fortgang, John M. Kinross-Wright, Nizar A. Ebrahim, John C. Goldstein, David J. Goldstein, Kara L. Hayes, Scott K. Volz, Roger W. Warren, and Michael E. Weber "Initial results of the infrared regenerative amplifier free-electron laser experiment", Proc. SPIE 3154, Coherent Electron-Beam X-Ray Sources: Techniques and Applications, (1 November 1997);

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