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分析了自由电子激光器中电子与波的相互作用过程，导出了相应的增益表达式。结果表明，它不仅能很好地反映自由电子激光器中相干辐射，而且表明了具有激光输出饱和特性。分析结果更加符合实验情况。The interaction process between electrons with electromagnetic waves in the free electron laser (FEL) is analysed and the corresponding gain expression is-derived. The result shows that it not only reflects the coherent emittanee of FEL, but also expounds the property with output saturation of lasers. The result of analysis is close to the experiment condition of FEL.
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