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Multiple-order diffractive engineered surface lenses.

Tom D Milster, Young Sik Kim, Zichan Wang

    Applied Optics
    |September 25, 2020
    PubMed
    Summary
    This summary is machine-generated.

    A novel multiple-order diffractive engineered (MODE) lens combines refractive and diffractive properties for imaging. This lens technology shows promise for future large-aperture, lightweight space telescopes.

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    Area of Science:

    • Optics and photonics
    • Diffractive optics
    • Optical engineering

    Background:

    • Traditional refractive and diffractive lenses have limitations in optical systems.
    • There is a need for advanced optical elements for space-based telescopes.

    Purpose of the Study:

    • To introduce and characterize a multiple-order diffractive engineered (MODE) lens.
    • To evaluate the performance of a MODE lens prototype for astronomical applications.

    Main Methods:

    • Theoretical calculations of Strehl ratio and encircled energy were performed.
    • A prototype MODE lens was designed and fabricated for the R-band wavelength range.
    • Experimental testing of the prototype lens was conducted to assess its optical performance.

    Main Results:

    • The focal position versus wavelength performance closely matched the design.
    • The measured focal spot diameter was 2.1 times larger than the ideal Airy spot.
    • The prototype telescope demonstrated angular resolution of 0.006°.

    Conclusions:

    • MODE lenses exhibit combined refractive and diffractive characteristics.
    • The prototype demonstrates feasibility for astronomical imaging.
    • MODE lenses offer potential for ultralightweight space telescope designs.