Zobrazeno 1 - 10
of 151
pro vyhledávání: '"QiKa Jia"'
Autor:
Haoran Zhang, Cheng Li, Zixin Guo, Xiazhen Xu, Jingya Li, Biaobin Li, Zhigang He, Shancai Zhang, Qika Jia
Publikováno v:
IEEE Photonics Journal, Vol 15, Iss 4, Pp 1-8 (2023)
Ultrashort terahertz (THz) beam is often affected by spatio-temporal distortion due to its long wavelength, and this spatio-temporal coupling will degrade the focusing effect. Here, we develop a numerical model for calculating the vector focusing of
Externí odkaz:
https://doaj.org/article/e5bc484b4a6948a8b3b17171bcc923e5
Narrowband Terahertz Emission With Tunable Orbital Angular Momentum by Vortex Laser-Beam Interaction
Autor:
Haoran Zhang, Wenxing Wang, Cheng Li, Zixin Guo, Zhigang He, Shancai Zhang, Qika Jia, Lin Wang
Publikováno v:
IEEE Photonics Journal, Vol 14, Iss 1, Pp 1-8 (2022)
Terahertz vortex beams need to be developed for supporting new applications in fundamental sciences. In this paper, a novel and feasible scheme is presented for generation of helically microbunched electron beam for the emission of terahertz (THz) vo
Externí odkaz:
https://doaj.org/article/d4b3b19e3a344ac9b7b5d24cd391fe89
Publikováno v:
Physical Review Accelerators and Beams, Vol 26, Iss 7, p 070701 (2023)
Undulator tapering based on a prebunched electron beam and a strong seed laser has been demonstrated as a promising method to greatly enhance free-electron laser (FEL) efficiency and suppress sideband instability. Different from the former works that
Externí odkaz:
https://doaj.org/article/7e779f9edbaa40fe817d7c794f9322f2
Publikováno v:
New Journal of Physics, Vol 25, Iss 1, p 013024 (2023)
We propose an all-optical technique to record the time information of relativistic electron beams with sub-optical-cycle duration. The technique is based on the interaction of the electron beam with the ponderomotive potential of an optical traveling
Externí odkaz:
https://doaj.org/article/3aa97ed9ba274a8284196ef6f39666dd
Publikováno v:
IEEE Photonics Journal, Vol 11, Iss 1, Pp 1-7 (2019)
The filtering and polarizing of terahertz waves are essential for various terahertz applications. Here, we use two-dimensional (2-D) rectangular subwavelength hole arrays (SHAs) to achieve efficient wave filtering and polarizing in the terahertz regi
Externí odkaz:
https://doaj.org/article/003e50b81662439baa05c2cad451c79e
Autor:
Haoran Zhang, Wenxing Wang, Shimin Jiang, Cheng Li, Zhigang He, Shancai Zhang, Qika Jia, Lin Wang, Duohui He
Publikováno v:
AIP Advances, Vol 11, Iss 5, Pp 055115-055115-6 (2021)
A scheme to generate coherent terahertz (THz) radiation carrying orbital angular momentum (OAM) through down-frequency conversion of optical lasers and higher order mode coupling is proposed and analyzed. Based on the laser–electron interaction in
Externí odkaz:
https://doaj.org/article/db7e0f10eb1f486d85ca78b398687bf7
Autor:
Zhouyu Zhao, Qika Jia
Publikováno v:
Physical Review Accelerators and Beams, Vol 25, Iss 5, p 050702 (2022)
The heavy heat load on optical components from the normal planar undulator has become a serious problem in the synchrotron radiation light source, especially for generating the low-energy photon in a high-energy storage ring and/or a diffraction-limi
Externí odkaz:
https://doaj.org/article/2e34e3ede0f5421c83a7774577c8761d
Autor:
Li Sun, Weihao Liu, Jie Zhou, Yunliang Zhu, Zijia Yu, Yucheng Liu, Qika Jia, Baogen Sun, Hongliang Xu
Publikováno v:
New Journal of Physics, Vol 23, Iss 6, p 063031 (2021)
Particle accelerator on chip with high acceleration gradient has been an unremitting goal of researchers. Dielectric laser accelerator (DLA) is a possible candidate to achieve this goal. However, due to the limitation of dielectric breakdown, it is d
Externí odkaz:
https://doaj.org/article/2e4a769e47b042f187cb577be0b16c91
Publikováno v:
Applied Sciences, Vol 10, Iss 4, p 1418 (2020)
We observed multiple-collision free-electron laser (FEL)-Compton backscattering in which a multi-bunch electron beam makes head-on collisions with multi-pulse FELs in an optical cavity, using an infrared FEL system in the storage ring NIJI-IV. It was
Externí odkaz:
https://doaj.org/article/61bff2e590ed4d48acf5225593ed526e
Publikováno v:
Physical Review Accelerators and Beams, Vol 23, Iss 2, p 020704 (2020)
A new scheme is proposed to generate electron beams with a frequency-chirped density modulation for producing ultrashort THz radiation pulse in an optimally tapered undulator. In this scheme, an energy chirped electron beam is sequentially modulated
Externí odkaz:
https://doaj.org/article/b4e2e05930d54f438d281453796e5231