P. M. Phillips, E. Marshall, C. Shaughnessy, J. Walsh
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A comparison at infrared wavelengths of metal-grating and dielectric-film free-electron lasers
A comparison of the tuning, gain, saturation, and beam-quality-related restrictions of metal-grating and dielectric-film free-electron lasers will be presented. While recent operation of the former has resulted in tunable radiation in the low mm wavelength band, indications are that the device may readily be scaled to operate at submm, far-infrared, and possibly shorter wavelengths. For the latter, operation to date has been well into the FIR. These results, and an in depth look at the prospects of the metal-grating FEL, will also be summarized.
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