【摘要】 为了获得短波长自由电子激光（ＦＥＬ），可以使储存环中的相对论性电子与外加强激光脉冲在光学速调管中充分耦合，从而产生高次谐波的相干辐射。为使耦合充分，必须使电子束团与激光脉冲在时间和空间上完全同步。其中空间上的同步可通过调节外激光的光路来实现，给出了实现时间上同步的一种方案。更多还原

【Abstract】 In order to generate shorter wavelength FEL,an electronic bunch has to be coupled with the external powerful laser pulses in optical klystron.In this process the coherent harmonic radiation will be generated.It is necessary that the electronic bunch and laser pulses are synchronic in both time and space.The synchronization in space can be realized by adjusting the light road of the external laser.In this paper,a method is suggested to obtain the synchronization in time.更多还原