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Double-pump technique - one step closer towards efficient liquid-based THz sources.

Evgenia A Ponomareva, Anton N Tcypkin, Semen V Smirnov

    Optics Express
    |November 6, 2019
    PubMed
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    Double-pulse laser irradiation significantly boosts terahertz (THz) wave generation from water jets by 4-fold. This method also helps determine the excited state lifetime of liquid water.

    Area of Science:

    • Physics
    • Optics
    • Quantum Mechanics

    Background:

    • Terahertz (THz) wave generation is crucial for various scientific applications.
    • Efficient THz generation from liquids like water remains a challenge.
    • Previous methods often involve complex setups or achieve lower efficiencies.

    Purpose of the Study:

    • To investigate the enhancement of THz wave generation using a double-pulse laser irradiation technique on a water jet.
    • To determine the optimal temporal delay between the two laser pulses for maximum THz output.
    • To explore the potential of this method for measuring the excited state lifetime of liquid water.

    Main Methods:

    • Irradiating a water jet with double, collinear laser pulses.
    • Varying the temporal delay between the pump pulses to study THz signal dependence.

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  • Performing numerical simulations using a theoretical model of high-intensity pulse interaction with an isotropic medium.

    • Main Results:

    • Achieved a 4-fold increase in THz wave generation compared to single-pulse excitation.
    • Identified an optimal temporal delay of 2-4 ps for maximum THz signal, corresponding to a complete pre-ionization state.
    • Demonstrated an optical-to-terahertz conversion efficiency of approximately 0.5 x 10^-3.
    • Numerical simulations accurately described experimental results with a population relaxation time of 3 ps.

    Conclusions:

    • The double-pump method significantly enhances THz wave generation efficiency from water jets.
    • This technique provides a means to determine the characteristic excited state lifetime of liquid water.
    • The achieved efficiency is comparable to or exceeds that of other THz generation methods in different media.