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Related Experiment Video

Updated: Jun 22, 2026

Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System
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Ultra low-loss low-efficiency diffraction gratings.

Tina Clausnitzer, E-B Kley, A Tünnermann

    Optics Express
    |June 5, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Ultra low-loss dielectric reflection gratings were developed with efficiencies as low as 0.02%. Placing the grating below the reflective layerstack minimizes scattering and thermal effects for high laser applications.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Dielectric reflection gratings are crucial optical components.
    • Minimizing optical losses and thermal effects is essential for high-power laser systems.
    • Current designs face challenges with scattering and substrate absorption.

    Purpose of the Study:

    • To develop ultra low-loss dielectric reflection gratings.
    • To reduce scattering losses in reflection gratings.
    • To enable efficient coupling of high laser radiation into high finesse cavities.

    Main Methods:

    • Designed dielectric reflection gratings.
    • Positioned gratings beneath a highly reflective layerstack.
    • Utilized an all-reflective optical path.

    Main Results:

    • Achieved diffraction efficiencies ranging from 7% down to 0.02%.
    • Significantly reduced scattering losses by strategic grating placement.
    • Demonstrated a method to circumvent substrate absorption-induced thermal effects.

    Conclusions:

    • The novel grating design significantly reduces optical losses.
    • This approach is suitable for high laser power and high finesse cavity applications.
    • Eliminates thermal issues associated with substrate absorption.