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有自由电子激光器中一般存在着二种受激辐射形式:自由电子激光辐射和回旋辐射。本文从理论上阐明,如果电子束的初始横向速度较大,自由电子激光器的参数选用不当则回旋辐射占优势,特别当电子束能量较低时产生回旋辐射的倾向更大。但是回旋辐射并不具有双重多普勒频率上漂移的特性,由于受轴向磁扬强度的限止,在电子束能量较高时其辐射频率要此自由电子激光辐射频率低得多。因此在自由电子激光器的实验研究中如何区别这二种辐射并有效地抑制回旋辐射是一个十分重要的课题。
There are two types of stimulated emission commonly used in free-electron lasers: free electron laser radiation and cyclotron radiation. This paper theoretically shows that if the initial lateral velocity of the electron beam is relatively large and the parameters of the free electron laser are improperly selected, the gyro radiation will prevail, especially when the energy of the electron beam is lower. However, the cyclotron radiation does not have the characteristic of double Doppler frequency drift. Due to the limitation of the axial magnetization, the radiofrequency is much lower than that of the free electron laser when the electron beam energy is high. Therefore, in the experimental study of free electron lasers, how to distinguish these two types of radiation and effectively suppress the gyrotron radiation is a very important issue.