Lei Shishan, Zhao Donghuan. Effect of electron beam divergence on free-electron laser output[J]. Chinese Journal of Lasers, 1987, 14(7): 390
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Our research shows that when the divergence of reiativistie electron beam entering into the wiggler increases, the gain of the free-electron lasers will be decreased and a small divergent angle will increase the output power. The maximum allowable divergent angle is determined by the laser oscillation conditions.