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In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation
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Published on: May 27, 2013

Supercontinuum generation versus optical breakdown in CO(2) gas.

F A Ilkov, L S Ilkova, S L Chin

    Optics Letters
    |October 6, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Optical breakdown (OB) and supercontinuum (SC) generation in CO2 gas depend on focusing conditions. Plasma formation is not essential for SC generation, with self-focusing playing a key role.

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    Area of Science:

    • Nonlinear Optics
    • Laser-Matter Interactions
    • Gas Spectroscopy

    Background:

    • Supercontinuum (SC) generation is crucial for various spectroscopic applications.
    • Optical breakdown (OB) in gases is often associated with high-intensity laser pulses.
    • Understanding the interplay between OB and SC generation is vital for optimizing laser-driven phenomena.

    Purpose of the Study:

    • To investigate the threshold powers for optical breakdown (OB) and supercontinuum (SC) generation in high-pressure CO2 gas.
    • To determine the influence of focusing conditions on OB and SC generation.
    • To elucidate the role of plasma formation and self-focusing in SC generation.

    Main Methods:

    • Experimental measurement of threshold powers for OB and SC generation.
    • Systematic variation of focusing lens focal length.
    • Analysis of SC spectra and plasma formation indicators.

    Main Results:

    • Threshold powers for OB and SC generation were measured in high-pressure CO2.
    • Varying focal length allowed transitions between OB without SC, OB with SC, and SC without OB.
    • Experimental results indicate plasma formation is not essential for SC generation.
    • Self-focusing significantly influences SC generation characteristics, making them dependent on external focusing conditions.

    Conclusions:

    • SC generation in CO2 gas can occur independently of plasma formation (OB).
    • External focusing conditions, particularly focal length, critically control the transition between OB and SC generation.
    • Self-focusing is a dominant mechanism driving SC generation, highlighting its importance over plasma effects in this regime.