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Folded monocentric imager with deformable mirror focus.

Glenn M Schuster, William M Mellette, Joseph E Ford

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    This summary is machine-generated.

    This study presents a novel catadioptric imager using an elastic element for focus adjustment. Mechanical deformation of a fold mirror achieved focus, demonstrating potential for compact optical systems.

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    Area of Science:

    • Optical Engineering
    • Imaging Systems

    Background:

    • Traditional imaging systems often require bulky mechanisms for focus adjustment.
    • Monocentric and catadioptric designs offer potential for miniaturization and aberration correction.

    Purpose of the Study:

    • To design and evaluate a catadioptric monocentric imager utilizing an elastic central element for focusing.
    • To compare different focusing methods, including mechanical deformation of a fold mirror.

    Main Methods:

    • Designed 6 mm and 12 mm focal length F/2.8 achromats.
    • Investigated focusing by sensor translation, fold mirror translation, and fold mirror spherical deformation.
    • Fabricated and tested a 12 mm focal length prototype using a polystyrene outer lens and optical gel.
    • Demonstrated focusing via mechanical deformation of the fold mirror.

    Main Results:

    • Successfully designed achromats with specified focal lengths and apertures.
    • Demonstrated focusing capability through mechanical deformation of the fold mirror.
    • Achieved a best focus Modulation Transfer Function 50 (MTF50) of 52.6 line pairs/mm at the spherical image surface.

    Conclusions:

    • The proposed catadioptric monocentric imager design enables focusing through elastic deformation.
    • Mechanical deformation of the fold mirror is a viable focusing strategy for this system.
    • The demonstrated resolution indicates the potential of this approach for practical imaging applications.