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Angle-resolved multioctave supercontinua from mid-infrared laser filaments.

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    Optics Letters
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    Angle-resolved spectral analysis reveals complex dynamics in mid-infrared laser filaments. This technique is crucial for understanding and predicting laser filamentation, enabling advanced pulse compression for high-power mid-infrared applications.

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    Area of Science:

    • Nonlinear Optics
    • Laser Physics
    • Ultrafast Science

    Background:

    • Laser-induced filamentation is a complex nonlinear optical phenomenon.
    • Understanding the spatiotemporal dynamics of mid-infrared (mid-IR) pulses is crucial for advanced laser applications.

    Purpose of the Study:

    • To investigate the intricate physical scenarios behind laser-induced filamentation in the mid-infrared.
    • To explore the utility of angle-resolved spectral analysis for characterizing mid-IR supercontinuum generation.
    • To demonstrate the potential for filamentation-assisted pulse compression in the mid-IR.

    Main Methods:

    • Generation of a multioctave high-energy supercontinuum using mid-IR laser filaments.
    • Utilizing angle-resolved spectral analysis to probe (3+1)-dimensional spatiotemporal evolution.
    • Employing supercomputer simulations for full field evolution analysis.

    Main Results:

    • Angle-resolved spectral analysis provides powerful insights into mid-IR laser filamentation dynamics.
    • Supercontinuum spectra span over five octaves, from mid-ultraviolet to mid-infrared.
    • Simulations highlight the critical importance of angle-resolved measurements for filamentation modeling.
    • Observed enhancement of ionization-induced blueshift offers new pulse compression approaches.

    Conclusions:

    • Angle-resolved spectral analysis is essential for understanding and modeling mid-IR laser filamentation.
    • The study enables the generation of high-power few- and single-cycle pulses in the mid-infrared.
    • Ellipticity of the driver beam is key to probing 3D filamentation dynamics.