中国物理B ›› 2018, Vol. 27 ›› Issue (5): 54101-054101.doi: 10.1088/1674-1056/27/5/054101

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Influence of cutting off position of plasma filament formed by two-color femtosecond laser on terahertz generation

Zhan-Qiang Xue(薛占强), Li-Ping Shang(尚丽平), Hu Deng(邓琥), Qian-Cheng Zhang(张前成), Quan-Cheng Liu(刘泉澄), Wei-Wei Qu(屈薇薇), Zhan-Feng Li(李占锋), Shun-Li Wang(王顺利)   

  1. 1 College of Information Engineer, Southwest University of Science and Technology, Mianyang 621010, China;
    2 Robot Technology Used for Special Environment Key Laboratory of Sichuan Province, Mianyang 621010, China;
    3 College of Manufacturing Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
  • 收稿日期:2017-12-20 修回日期:2018-01-27 出版日期:2018-05-05 发布日期:2018-05-05
  • 通讯作者: Li-Ping Shang E-mail:shangliping@swust.edu.cn
  • 基金资助:
    Project supported by the National Defense Basic Scientific Research Program of China (Grant No.Z202013T001) and Postgraduate Innovation Fund Project by Southwest University of Science and Technology,China (Grant No.16ycx104).

Influence of cutting off position of plasma filament formed by two-color femtosecond laser on terahertz generation

Zhan-Qiang Xue(薛占强)1, Li-Ping Shang(尚丽平)1,2, Hu Deng(邓琥)1, Qian-Cheng Zhang(张前成)1, Quan-Cheng Liu(刘泉澄)1, Wei-Wei Qu(屈薇薇)1, Zhan-Feng Li(李占锋)3, Shun-Li Wang(王顺利)1   

  1. 1 College of Information Engineer, Southwest University of Science and Technology, Mianyang 621010, China;
    2 Robot Technology Used for Special Environment Key Laboratory of Sichuan Province, Mianyang 621010, China;
    3 College of Manufacturing Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
  • Received:2017-12-20 Revised:2018-01-27 Online:2018-05-05 Published:2018-05-05
  • Contact: Li-Ping Shang E-mail:shangliping@swust.edu.cn
  • Supported by:
    Project supported by the National Defense Basic Scientific Research Program of China (Grant No.Z202013T001) and Postgraduate Innovation Fund Project by Southwest University of Science and Technology,China (Grant No.16ycx104).

摘要: Femtosecond laser filamentation is a method of generating terahertz, which has wide application in terahertz sub-wavelength resolution imaging. In this paper, the plasma filament formed by femtosecond laser focusing was terminated with an alumina ceramics at different positions and the influence of the cutting off position of the plasma filament on the terahertz wave was studied. The results showed that the terahertz amplitude increases as the position approaches the end of the filament gradually. The stability of amplitude and peak frequency of the terahertz generated by the filament formed by two-color femtosecond laser via a lens with a longer focal length is lower than that through a lens with a shorter focal length, especially the terahertz amplitude at the end of the filament. The study will be helpful for future researchers in the field of THz sub-wavelength imaging utilizing femtosecond laser filament.

关键词: terahertz, laser filament

Abstract: Femtosecond laser filamentation is a method of generating terahertz, which has wide application in terahertz sub-wavelength resolution imaging. In this paper, the plasma filament formed by femtosecond laser focusing was terminated with an alumina ceramics at different positions and the influence of the cutting off position of the plasma filament on the terahertz wave was studied. The results showed that the terahertz amplitude increases as the position approaches the end of the filament gradually. The stability of amplitude and peak frequency of the terahertz generated by the filament formed by two-color femtosecond laser via a lens with a longer focal length is lower than that through a lens with a shorter focal length, especially the terahertz amplitude at the end of the filament. The study will be helpful for future researchers in the field of THz sub-wavelength imaging utilizing femtosecond laser filament.

Key words: terahertz, laser filament

中图分类号:  (Electromagnetic wave propagation; radiowave propagation)

  • 41.20.Jb
52.38.Hb (Self-focussing, channeling, and filamentation in plasmas)