中国物理B ›› 2018, Vol. 27 ›› Issue (8): 84209-084209.doi: 10.1088/1674-1056/27/8/084209

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

Enhancement and modulation of terahertz radiation by multi-color laser pulses

Min-Jie Pei(裴敏洁), Chen-Hui Lu(卢晨晖), Xian-Wei Wang(王宪位), Zhen-Rong Sun(孙真荣), Shi-An Zhang(张诗按)   

  1. 1 State Key Laboratory of Precision Spectroscopy, and School of Physics and Materials Science, East China Normal University, Shanghai 200062, China;
    2 College of Mechanical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China;
    3 College of Science, Zhejiang University of Technology, Hangzhou 310023, China
  • 收稿日期:2018-03-14 修回日期:2018-05-12 出版日期:2018-08-05 发布日期:2018-08-05
  • 通讯作者: Chen-Hui Lu, Shi-An Zhang E-mail:lchhuiz@163.com;sazhang@phy.ecnu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 11604205) and the Talent Program of Shanghai University of Engineering Science, China.

Enhancement and modulation of terahertz radiation by multi-color laser pulses

Min-Jie Pei(裴敏洁)1, Chen-Hui Lu(卢晨晖)2, Xian-Wei Wang(王宪位)3, Zhen-Rong Sun(孙真荣)1, Shi-An Zhang(张诗按)1   

  1. 1 State Key Laboratory of Precision Spectroscopy, and School of Physics and Materials Science, East China Normal University, Shanghai 200062, China;
    2 College of Mechanical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China;
    3 College of Science, Zhejiang University of Technology, Hangzhou 310023, China
  • Received:2018-03-14 Revised:2018-05-12 Online:2018-08-05 Published:2018-08-05
  • Contact: Chen-Hui Lu, Shi-An Zhang E-mail:lchhuiz@163.com;sazhang@phy.ecnu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 11604205) and the Talent Program of Shanghai University of Engineering Science, China.

摘要: We study theoretically intense terahertz radiation from multi-color laser pulse with uncommon frequency ratios. Comparing the two-color laser scheme, of which the uncommon frequency ratio should be set to be a specific value, we show that by using multi-color harmonic laser pulses as the first pump component, the lasers as the second pump component can be adjusted in a continuous frequency range. Moreover, these multi-color laser pulses can effectively modulate and enhance the terahertz radiation, and the terahertz yield increases with the increase of the wavelength of the uncommon pump component and is stable to the laser relative phase. Finally, we utilize the electron densities and velocities of ionization events to illustrate the physical mechanism of the intense terahertz generation.

关键词: THz generation, multi-color scheme, laser-plasma interaction, uncommon frequency ratio

Abstract: We study theoretically intense terahertz radiation from multi-color laser pulse with uncommon frequency ratios. Comparing the two-color laser scheme, of which the uncommon frequency ratio should be set to be a specific value, we show that by using multi-color harmonic laser pulses as the first pump component, the lasers as the second pump component can be adjusted in a continuous frequency range. Moreover, these multi-color laser pulses can effectively modulate and enhance the terahertz radiation, and the terahertz yield increases with the increase of the wavelength of the uncommon pump component and is stable to the laser relative phase. Finally, we utilize the electron densities and velocities of ionization events to illustrate the physical mechanism of the intense terahertz generation.

Key words: THz generation, multi-color scheme, laser-plasma interaction, uncommon frequency ratio

中图分类号:  (Ultrafast processes; optical pulse generation and pulse compression)

  • 42.65.Re
32.80.Fb (Photoionization of atoms and ions) 52.50.Jm (Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.))