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真空电子器件产生的THz辐射通常是基于环形或直线型的加速器装置。飞秒级的电子束团通过周期性的磁铁可产生高功率、宽带可调谐的相干太赫兹辐射。这种高功率的太赫兹源为太赫兹技术的应用研究提供了新的手段。介绍了一种基于飞秒直线加速器装置产生的相干太赫兹波荡器辐射源,它主要由S波段热阴极微波电子枪,α磁铁和SLAC型加速管组成,该装置能够提供具有20～30 MeV能量、束团长度为100～300 fs的电子束团。波荡器采用的是Apple-II型波荡器,通过调节波荡器两平行磁块的位置可以产生具有不同极化特性的太赫兹辐射。为了测量波荡器产生的相干THz辐射谱,采用改进型的迈克尔逊干涉仪来进行测量,给出了实验装置的介绍以及实验结果。
THz radiation produced by vacuum electronics is usually based on toroidal or linear accelerator devices. Femtosecond-class electron bunches produce high-power, broadband-tunable, coherent terahertz radiation through periodic magnets. This high-power terahertz source provides a new approach to the application of terahertz technology. A coherent terahertz wave generator radiation source based on a femtosecond linear accelerator device is introduced. The device mainly consists of an S-band hot cathode microwave electron gun, an alpha magnet and a SLAC type accelerating tube. The device can provide energy of 20-30 MeV, Bunch length of 100 ~ 300 fs of the electron bunch. The undulator uses an Apple-II undulator, which produces terahertz radiation with different polarization characteristics by adjusting the position of two parallel magnetic blocks of the undulator. In order to measure the coherent THz radiation spectrum generated by the undulator, a modified Michelson interferometer was used to measure the experimental device and the experimental results were given.