采用飞秒装置的高功率宽带太赫兹源

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，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?鄄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。

High power wideband terahertz sources based on femtosecond facility

The THz radiation generated by the vacuum electron device is often the ring-based or linac-based source.The generation of relativistic,sub-picosecond electron pulses allows the direct production of high-power,coherent THz radiation by passing the electron beam through an undulator.This provides a reliable and easily tunable powerful source of THz radiation for scientific applications.In this paper,the generation and observation of coherent THz undulator radiation from a femtosecond accelerator facility was reported.The accelerator facility consisted of an S-band thermionic cathode RF-gun,an alpha magnet and a SLAC-type accelerating tube,which could provide the electron bunches with energy of 20-30 MeV and bunch length of 100-300 fs.The undulator was an Apple-II type undulator,which could operate in various linear,elliptical or circular modes when the two rows at one diagonal moved along the longitudinal direction.To measure the frequency spectrum of the THz radiation,a modified Michelson interferometer was employed.The experiment setups were described and experiment results were given.