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  • Received: Feb. 18, 2020

    Accepted: Apr. 30, 2020

    Posted: Jun. 8, 2020

    Published Online: Jun. 9, 2020

    The Author Email: Heping Zeng (

    DOI: 10.3788/COL202018.073201

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    Min Li, Zhenyu Li, Junyi Nan, Yu Xia, Mingyang He, Feng Wang, Wenhui Lu, Shuai Yuan, Heping Zeng. THz generation from water wedge excited by dual-color pulse[J]. Chinese Optics Letters, 2020, 18(7): 073201

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Chinese Optics Letters, Vol. 18, Issue 7, 073201 (2020)

THz generation from water wedge excited by dual-color pulse

Min Li1, Zhenyu Li1, Junyi Nan2, Yu Xia1, Mingyang He1, Feng Wang1, Wenhui Lu1, Shuai Yuan2, and Heping Zeng1,2,*

Author Affiliations

  • 1Shanghai Key Laboratory of Modern Optical System, Engineering Research Center of Optical Instrument and System, Ministry of Education, School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
  • 2State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China


Terahertz (THz) waves could be generated through exciting a gravity-guided, free-flowing water wedge by a dual-color pulse. It is not required to rotate the optimal angle considering the water film as an ionization medium. It is demonstrated to be more effective to generate stronger THz radiation when the ionization position is on the front surface of the air water interface of the water wedge by moving its position. The effect of pulse energy on THz generation is also investigated, and it is observed that with the increase of pulse energy the THz electric field shows a quadratic rising trend. These observations are consistent with air plasma induced THz emission.


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