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    Area of Science:

    • Nonlinear Optics
    • Laser-Induced Plasmas
    • Quantum Electronics

    Background:

    • Second harmonic generation (SHG) is a key nonlinear optical process.
    • Laser-induced air plasmas offer unique environments for studying light-matter interactions.
    • Understanding temporal dynamics is crucial for optimizing nonlinear processes.

    Purpose of the Study:

    • To investigate the mechanisms behind significantly enhanced SHG in laser-induced air plasma.
    • To analyze the temporal dynamics and polarization characteristics of the generated second harmonic wave.
    • To explore the influence of fundamental pulse duration and polarization configurations on SHG efficiency.

    Main Methods:

    • Systematic investigation of temporal dynamics of frequency conversion.
    • Analysis of the polarization of the emitted second harmonic beam.
    • Utilizing an orthogonal pump-probe configuration with varying fundamental pulse durations (0.1 ps to >2 ps).

    Main Results:

    • Observed a near hundred-fold enhancement in SHG efficiency.
    • Enhanced SHG efficiency was confined to a sub-picosecond temporal window.
    • Efficiency remained constant across a broad range of fundamental pulse durations.
    • Demonstrated a complex polarization dependence of the second harmonic field on both input beams.

    Conclusions:

    • The enhanced SHG in laser-induced air plasma exhibits unique temporal characteristics distinct from typical nonlinear optical processes.
    • The observed phenomenon is highly sensitive to the temporal dynamics within the plasma.
    • The orthogonal pump-probe configuration reveals intricate polarization dynamics crucial for understanding the underlying physics.