Generation of Terahertz Coherent Synchrotron Radiation by using Laser and Electron Beam

使用激光和电子束产生太赫兹相干同步辐射

基本信息

批准号：
17360039
负责人：
KATOH Masahiro
金额：
$ 7.95万
依托单位：
Institute for Molecular Science
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

项目摘要

We have succeeded in producing coherent synchrotron radiation in the terahertz region by using relativistic electron bunches with micro-density structures. The micro-structures were created by a newly developed method, which utilize the interaction between electrons and laser field. Electrons traveling with laser pulse in alternating magnetic field can exchange their energy with laser field under some resonant condition. As the result, an energy modulation is created on the electron bunch. This energy modulation is converted to a density modulation as the electron bunch is proceeding in the accelerator, as the result of the energy dependence of the path length. Such system has been constructed on the UVSOR-II electron storage ring in Institute for Molecular Science.We have successfully demonstrated that an electron bunch with a single dip structure of sub-picosecond width emitted intense broadband coherent THz pulse. The dip structure was created by injecting femtosecond laser pulses into the storage ring.We have also demonstrated that an electron bunch with a periodic micro-structure of a sub-picosecond period emitted narrowband coherent THz pulse. In this case, amplitude modulated laser pulses are injected into the ring, which were created by newly developed system in collaboration with a research group of Lille University France. It is well known that synchrotron radiation is extremely broadband from radio-wave to X-rays. This is the first experimental result that monochromatic synchrotron radiation is extracted from a uniform magnetic field. By changing the period of the microstructure, we could change the radiation wavelength.The results have indicated the possibility to control the amplitude and the phase of synchrotron radiation. The developed method can be realized most of the existing synchrotron light sources.

我们利用具有微密度结构的相对论电子束，成功地在太赫兹区域产生了相干同步辐射。微结构是通过一种新开发的方法创建的，该方法利用电子和激光场之间的相互作用。在交变磁场中随激光脉冲行进的电子在某种谐振条件下可以与激光场交换能量。结果，在电子束上产生能量调制。当电子束在加速器中行进时，由于路径长度的能量依赖性，这种能量调制被转换为密度调制。该系统已在分子科学研究所UVSOR-II电子存储环上构建。我们成功地证明了亚皮秒宽度的单倾结构电子束发射强宽带相干太赫兹脉冲。该倾角结构是通过将飞秒激光脉冲注入存储环而形成的。我们还证明了具有亚皮秒周期周期性微结构的电子束发射窄带相干太赫兹脉冲。在这种情况下，调幅激光脉冲被注入环中，该环是由与法国里尔大学研究小组合作新开发的系统创建的。众所周知，同步加速器辐射从无线电波到X射线都是极其宽带的。这是首次从均匀磁场中提取单色同步辐射。通过改变微结构的周期，我们可以改变辐射波长。结果表明控制同步辐射的幅度和相位的可能性。所开发的方法可以实现大多数现有的同步加速器光源。