探讨了射频型远红外波导自由电子激光器（ＦＩＲ—ＦＥＬ）中产生超短光脉冲的可能性。由于短电子束辐射出与其长度相当的光脉冲．因此提出了选择适当的电子束起始相速度来确保正增益和光脉冲折射率沿相对滑移方向单调增加，这样当光脉冲渡越折射率渐变的“增益介质”—电子束团时．光脉冲前后沿将向中心相向移动而使其径向宽度被压缩。则可能获得远红外波段的高功率超短光脉冲。 The possibility of generating ultrashort optical pulses in the RF FIR-FEL was discussed. Since the short electron beam radiates an optical pulse of comparable length to it. Therefore, it is proposed to select the appropriate initial phase velocity of the electron beam to ensure that the positive gain and the monotonous increase of the refractive index of the optical pulse along the relative slip direction, so that when the light pulse crosses the “gain medium” -electron bunch of the gradual refractive index gradient. The front and back edges of the light pulse move toward the center to compress the radial width. It is possible to obtain a high power ultrashort optical pulse in the far infrared band.