First demonstration of coherent resonant backward diffraction radiation for a quasi-monochromatic terahertz-light source
First demonstration of coherent resonant backward diffraction radiation for a quasi-monochromatic terahertz-light source
复制标题
首次演示准单色太赫兹光源的相干共振后向衍射辐射
DOI：
10.1038/s41598-020-64426-1
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发表时间：
2020
影响因子：
4.6
通讯作者：
Takahashi Toshiharu
中科院分区：
文献类型：
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作者：
Sei Norihiro;Takahashi Toshiharu
我们提出相干共振后向衍射辐射（CRBDR）作为一种独特的强太赫兹（THz）光源，利用高能电子束加速器设施中的紧凑型衍射仪组件产生波长可调谐的准单色光。将周期性排列的空心衍射器发射的相干后向衍射辐射叠加，可以放大满足谐振条件的频率分量，使辐射单色。我们利用京都大学综合辐射与核科学研究所的l波段直线加速器演示了CRBDR。观察到相干后向衍射辐射在CRBDR理论的基共振频率处被放大了3倍以上。此外，在辐射功率饱和时衍射仪的数量与束内电子分布估计的数量是一致的。实验结果表明，CRBDR在太赫兹波段作为准单色光源是有用的。
We proposed coherent resonant backward diffraction radiation (CRBDR), which generates wavelength-tunable quasi-monochromatic lights using a compact diffractor assembly in an accelerator facility of high-energy electron beams, as a unique intense terahertz (THz) light source. Superimposing the coherent backward diffracted radiation emitted by periodically arranged hollow diffractors, it is possible to amplify the frequency components satisfying a resonant condition, and make the radiation monochromatic. We demonstrated the CRBDR using the L-band linac at the Institute for Integrated Radiation and Nuclear Science at Kyoto University. It was observed that the coherent backward diffraction radiation was amplified more than three times at a frequency which was the fundamental resonant frequency in the CRBDR theory. Moreover, the number of diffractors at the saturation of the radiation power was consistent with the number estimated from the electron distribution in a bunch. The experimental results show that the CRBDR is useful as a quasi-monochromatic light source in the THz band.