Aryshev A, Potylitsyn A P, Naumenko G A, Shevelev M, Shkitov D, Sukhikh L G, Terunuma N, Urakawa J
KEK: High Energy Accelerator Research Organization, 1-1 Oho, Ibaraki, 305-0801, Tsukuba, Japan.
Tomsk Polytechnic University, Lenin ave. 30, Tomsk, 634050, Russian Federation, Russia.
Sci Rep. 2020 May 5;10(1):7589. doi: 10.1038/s41598-020-63462-1.
The development of linac-based narrow-band THz sources with sub-picosecond, [Formula: see text]-level radiation pulses is in demand from the scientific community. Intrinsically monochromatic emitters such as coherent Smith-Purcell radiation sources appear as natural candidates. However, the lack of broad spectral tunability continues to stimulate active research in this field. We hereby present the first experimental investigation of coherent grating diffraction radiation (GDR), for which comparable radiation intensity with central frequency fine-tuning in a much wider spectral range has been confirmed. Additionally, the approach allows for bandwidth selection at the same central frequency. The experimental validation of performance included the basic spectral, spatial and polarization properties. The discussion of the comparison between GDR intensity and other coherent radiation sources is also presented. These results further strengthen the foundation for the design of a tabletop wide-range tunable quasi-monochromatic or multi-colour radiation source in the GHz-THz frequency range.
科学界需要开发基于直线加速器的窄带太赫兹源，其具有亚皮秒、毫瓦级的辐射脉冲。诸如相干史密斯-珀塞尔辐射源等本质上单色的发射器似乎是天然的候选者。然而，缺乏宽光谱可调性继续刺激着该领域的积极研究。我们在此展示了对相干光栅衍射辐射（GDR）的首次实验研究，已证实其在更宽光谱范围内具有可比的辐射强度且中心频率可微调。此外，该方法允许在相同中心频率下进行带宽选择。性能的实验验证包括基本的光谱、空间和偏振特性。还给出了GDR强度与其他相干辐射源之间比较的讨论。这些结果进一步加强了在吉赫兹-太赫兹频率范围内设计桌面式宽范围可调谐准单色或多色辐射源的基础。
