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Related Concept Videos

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A Multimodal Wide-Field Fourier-Transform Raman Microscope
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Frequency tripling mirror.

Cristina Rodríguez, Stefan Günster, Detlev Ristau

    Optics Express
    |December 25, 2015
    PubMed
    Summary
    This summary is machine-generated.

    A novel frequency tripling mirror (FTM) enhances third harmonic generation by over five orders of magnitude using a 25-layer aperiodic metal oxide structure. This optical interference coating achieves nearly one percent conversion efficiency for ultrashort laser pulses.

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    Area of Science:

    • Nonlinear Optics
    • Materials Science
    • Optical Engineering

    Background:

    • Third harmonic generation (THG) is crucial for frequency conversion in lasers.
    • Existing THG methods often suffer from low efficiency and phase mismatch.
    • Development of efficient reflective THG devices is an ongoing challenge.

    Purpose of the Study:

    • To design, fabricate, and demonstrate a frequency tripling mirror (FTM).
    • To achieve high-efficiency third harmonic (TH) generation in reflection.
    • To explore the potential of aperiodic metal oxide layers for nonlinear optical applications.

    Main Methods:

    • Designing an aperiodic sequence of metal oxide layers on a fused silica substrate.
    • Utilizing optical interference coating principles for enhanced THG.
    • Fabricating and testing a 25-layer FTM structure.

    Main Results:

    • The 25-layer FTM demonstrated a predicted increase in reflected TH by over five orders of magnitude compared to a single hafnia layer.
    • Global compensation of phase mismatch and field enhancement contributed to the improved performance.
    • Single pulse conversion efficiencies approaching 1% were achieved for near-infrared, 55 fs pulses.

    Conclusions:

    • The developed FTM is a highly efficient nonlinear optical component for reflective THG.
    • The design is scalable for higher conversion efficiencies, broader bandwidths, and different wavelength regions.
    • This technology offers a promising approach for advanced laser systems and optical applications.