The effects of variation of permittivity in the Cherenkov FEL on the output property of laser were calculated. The results show that, smaller or larger values of permittivity not only decrease the efficiency of laser, but also greatly influence the gain property of laser.
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赵东焕. Cherenkov型自由电子激光器中介电系数选择的研究[J].红外与毫米波学报,1993,12(6):]. ZHAO DONGHUAN. THE CHOICE OF PERMITTIVITY IN THE CHERENKOV FEL[J]. J. Infrared Millim. Waves,1993,12(6).]