National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973, USA.
Phys Rev Lett. 2011 Nov 11;107(20):204801. doi: 10.1103/PhysRevLett.107.204801.
We report the generation of tunable, narrow-band, few-cycle and multicycle coherent terahertz (THz) pulses from a temporally modulated relativistic electron beam. We demonstrate that the frequency of the THz radiation and the number of the oscillation cycles of the THz electric field can be tuned by changing the modulation period of the electron beam through a temporally shaped photocathode drive laser. The central frequency of the THz spectrum is tunable from ∼0.26 to 2.6 THz with a bandwidth of ∼0.16 THz.
我们报告了从时间调制的相对论电子束中产生可调谐、窄带、少周期和多周期相干太赫兹（THz）脉冲。我们证明，通过改变光阴极驱动激光的时间形状，可以通过改变电子束的调制周期来调谐 THz 辐射的频率和 THz 电场的振荡周期数。THz 光谱的中心频率可调谐范围为 ∼0.26 到 2.6 THz，带宽约为 ∼0.16 THz。
