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Updated: Feb 19, 2026

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Continuous-relief diffractive microlenses for laser beam focusing.

Matthew Day, Kaushal Choonee, David Cox

    Optics Express
    |November 3, 2017
    PubMed
    Summary
    This summary is machine-generated.

    Researchers fabricated microscale diffractive lenses using focused ion beam milling. These lenses demonstrate high diffraction efficiency and precise focusing, suitable for advanced optical applications like trapped-ion systems.

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    Area of Science:

    • Optics and Photonics
    • Microfabrication

    Background:

    • Diffractive lenses offer miniaturization potential.
    • Precise control over optical elements is crucial for advanced systems.

    Purpose of the Study:

    • To fabricate and characterize microscale, continuous-profile diffractive lenses.
    • To evaluate their optical performance and suitability for specific applications.

    Main Methods:

    • Focused ion beam milling of glass substrates to create micro-structured profiles.
    • Confocal microscopy for profile analysis.
    • Laser beam profiling to quantify optical performance.

    Main Results:

    • Fabrication of 125 μm × 125 μm lenses with up to 18 annuli.
    • Demonstrated focusing at 400 μm, 450 μm, and 500 μm.
    • Achieved maximum diffraction efficiency of 84% and side-lobe suppression to 10⁻⁴.

    Conclusions:

    • Microscale diffractive lenses can be precisely fabricated with high performance.
    • The characterized lenses show excellent agreement between predicted and measured performance.
    • These lenses are suitable for integration with trapped-ion systems.