Abstract
Abstract : Observations of Optical Guiding in a Raman Free-Electron Laser; Evidence for optical guiding of 1.7-mm-wavelength radiation along an electron beam in a Raman free-electron laser is obtained experimentally and compared with numerical simulations. Optical guiding is manifest as the interference effect of several waveguide modes; this is observed beyond the point of electron-beam termination. The experiment operates in the regime of exponential signal gain and appreciable electron-beam space charge. Sideband instabilities and optical guiding in a free-electron laser: experiment and theory; Experimental and theoretical studies of the effects of tapering and optical guiding on sideband instabilities are reported. The experiments are performed in the Columbia Raman FEl (about 2mm). Experiment shows sizeable reductions in sideband amplitudes in an efficiency-enhanced undulator. In the presence of optical guiding in a constant-period undular, the sideband shift is larger compared with the case when optical guiding does not occur. Keywords: Etalons.
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