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利用自由电子激光中电子与辐射波多次相互作用原理，获得了大信号情况下自由电子激光增益表达式。结果表明，大信号增益公式可圆满地解释自由电子激光器实验中激光输出饱和现象。
By using the principle of multiple interaction between electrons and radiation in a free electron laser, the expression of free electron laser gain under large signal is obtained. The results show that the large signal gain formula can satisfactorily explain the laser output saturation phenomenon in the free electron laser experiment.