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Odd harmonics-enhanced supercontinuum in bulk solid-state dielectric medium.

N Garejev, V Jukna, G Tamošauskas

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    Summary
    This summary is machine-generated.

    We generated an ultrabroadband supercontinuum in a CaF2 crystal using mid-infrared laser pulses. This broad spectrum, spanning over 4 octaves, is enhanced by harmonic generation and plasma effects.

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    Area of Science:

    • Nonlinear Optics
    • Laser Physics
    • Materials Science

    Background:

    • Supercontinuum generation is crucial for various spectroscopic applications.
    • Understanding nonlinear optical phenomena in crystalline media is essential for advanced laser technologies.

    Purpose of the Study:

    • To investigate ultrabroadband supercontinuum generation in a thin calcium fluoride (CaF2) crystal.
    • To explore the underlying physical mechanisms, including harmonic generation and plasma effects, governing the spectral broadening.

    Main Methods:

    • Experimental generation of supercontinuum using intense mid-infrared laser pulses (2.4 μm central wavelength).
    • Analysis of the supercontinuum spectrum covering ultraviolet to mid-infrared wavelengths.
    • Numerical simulations using a nonparaxial unidirectional propagation equation to model nonlinear effects.

    Main Results:

    • Achieved supercontinuum spanning more than 4 octaves in CaF2 crystal.
    • Observed spectral enhancement on the short-wavelength side due to cascaded third, fifth, and seventh harmonic generation.
    • Captured the transition from Kerr-dominated to plasma-dominated filamentation, identifying plasma-induced pulse compression and cross-phase modulation as key broadening mechanisms.

    Conclusions:

    • Thin CaF2 crystals are effective for generating ultrabroadband supercontinua.
    • Plasma dynamics significantly influence supercontinuum generation and spectral broadening in the plasma-dominated regime.
    • Numerical simulations accurately reproduce experimental observations, validating the theoretical model.