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- W2119366987 abstract "Focusing of light by the electron beam in a free-electron laser has been predicted for several years. In a high-gain system, complete cancellation of diffractive spreading within the interaction region may be possible, resulting in an optical beam that can be guided and amplified for many tens of meters. Until now, no direct experimental evidence for FEL self-focusing has existed in support of the theory. This dissertation reports measurements made of transverse-mode evolution in the Stanford Photon Research Lab Free Electron Laser oscillator - the Mark III. Transverse-mode characteristics were obtained by sampling the beam in the far field with small apertures which could be positioned freely in the transverse plane. Time-resolved signals received by the sampling system were analyzed to infer mode changes that occur in the laser between small signals, where the influence of the electron beam is strongest, and saturation, where the gain has fallen to cavity-loss levels. Data indicate that intracavity focusing of the light occurs in small signal, and diminishes as the laser approaches saturation. The data are compared to theory in the form of an FEL simulation code." @default.
- W2119366987 created "2016-06-24" @default.
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- W2119366987 date "1987-01-01" @default.
- W2119366987 modified "2023-09-24" @default.
- W2119366987 title "Transverse-mode evolution in a free-electron-laser oscillator" @default.
- W2119366987 hasPublicationYear "1987" @default.
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