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  • Received: Dec. 3, 2019

    Accepted: Feb. 10, 2020

    Posted: Feb. 28, 2020

    Published Online: Feb. 28, 2020

    The Author Email: Jin Qi (, E Yiwen (, Gao Shenghan (, Zhang Xi-Cheng (

    DOI: 10.1117/1.AP.2.1.015001

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    Qi Jin, Yiwen E, Shenghan Gao, Xi-Cheng Zhang. Preference of subpicosecond laser pulses for terahertz wave generation from liquids[J]. Advanced Photonics, 2020, 2(1): 015001

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Advanced Photonics, Vol. 2, Issue 1, 015001 (2020)

Preference of subpicosecond laser pulses for terahertz wave generation from liquids

Qi Jin, Yiwen E, Shenghan Gao, and Xi-Cheng Zhang*

Author Affiliations

  • University of Rochester, The Institute of Optics, Rochester, New York, United States


Terahertz (THz) wave generation from laser-induced air plasma generally requires a short temporal laser pulse. In contrast, it was observed that THz radiation from ionized liquid water prefers a longer pulse, wherein the mechanism remains unclear. We attribute the preference for longer pulse duration to the process of ionization and plasma formation in water, which is supported by a numerical simulation result showing that the highest electron density is achieved with a subpicosecond pulse. The explanation is further verified by the coincidence of our experimental result and simulation when the thickness of the water is varied. Other liquids are also tested to assure the preference for such a pulse is not exclusive to water.


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