Abstract
The angular spectrum of spontaneous emission in a two-dimensional undulator free-electron laser is analyzed theoretically. Numerical calculation shows that thes-th harmonic spontaneous emission power density can be greatly enhanced by using a two-dimensional undulator, for whichl=s, so the harmonic number can be selected by selectingl. Therefore, the higher harmonic operation of a free-electron laser can be realized selectively.
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Liangfu, P., Zhonghai, Y. & Shenggang, L. Angular spectrum property of spontaneous emission in a two-dimensional undulator free-electron laser. J. of Electron.(China) 11, 64–70 (1994). https://doi.org/10.1007/BF02778353
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DOI: https://doi.org/10.1007/BF02778353