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White-light generation with sub-ps pulses.

Anne-Laure Calendron, Hüseyin Çankaya, Giovanni Cirmi

    Optics Express
    |June 16, 2015
    PubMed
    Summary
    This summary is machine-generated.

    Researchers generated white light supercontinuum using sub-picosecond pulses. Two interacting mechanisms, multi-photon excitation and avalanche ionization, were observed, preventing beam collapse during white-light generation.

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    Area of Science:

    • Physics
    • Optics
    • Nonlinear Optics

    Background:

    • Supercontinuum generation is crucial for various optical applications.
    • Understanding the underlying mechanisms of white-light generation is essential for optimizing the process.

    Purpose of the Study:

    • To investigate white light supercontinuum generation using sub-picosecond pulses.
    • To compare spectral properties and stability across different experimental conditions.
    • To identify optimal parameters for sub-picosecond pulse durations.

    Main Methods:

    • Generation of white light supercontinuum from 1.03 µm and 515 nm pulses.
    • Systematic variation of crystals, focusing conditions, and pulse durations.
    • Comparison of experimental results with theoretical models (Brodeur and Chin).

    Main Results:

    • Successful generation of white light supercontinuum was achieved.
    • Optimal parameters for sub-picosecond driver pulse duration were determined.
    • Experimental observations indicated an interaction between multi-photon excitation and avalanche ionization.

    Conclusions:

    • The study identified key parameters for efficient sub-picosecond supercontinuum generation.
    • A dual mechanism involving multi-photon excitation and avalanche ionization was observed.
    • These interacting mechanisms prevent catastrophic beam collapse in the studied pulse duration regime.