Dissertation Defense: Yufeng Yan

    Monday, November 18, 2019 - 3:00pm
    Meinel 447

    Dissertation Title:Selected Topics in Novel Optical Design


    Dr. Jose Sasian (chair)
    Dr. Jim Schwiegerling
    Dr. Rongguang Liang


    This dissertation discusses several selected topics in novel optical design and engineering, including photographic fisheye lens design for 35mm format cameras, miniature camera lens design with a freeform surface, applications and optical performance consideration of liquid lenses.

    For the topic of photographic fisheye lens design for 35mm format cameras, a detailed discussion on design and optimize photographic fisheye lenses is provided. Fundamentals of fisheye lenses, such as the history, different fisheye projection methods with mathematical derivation, unique properties and design issues for fisheye lenses are discussed. Design methods of a zoom fisheye lens are also introduced. Aberration control of a two-group zoom lens is explained from a novel perspective and a large aperture zoom fisheye lens for 35mm DSLR cameras with good optical performance is presented.

    For the topic of miniature camera lens design, the author first reviews design challenges and current aspherical surfaces that are being used for miniature camera lenses. Then a freeform surface based on pedal curve to the ellipse is presented and explained in detail. Optical performance of two sets of miniature lenses with similar structure but different surface types are evaluated. Evaluations show that miniature camera lenses designed with pedal surfaces are not only better in nominal performance, but also have much better tolerance performance. Such designs have great potential to increase yield for highly demanded miniature cameras.

    For the last topic, different applications based on liquid lenses are presented with author designed examples. Then optical performance of 3D microscopy based on liquid lenses are evaluated in both optical simulation and lab experiment. High impact to image quality from gravity is observed. Chromatic aberration is also realized in both simulation and experiment results. A novel method to correct axial chromatic aberration for liquid lens at different power setting is then presented with some achromatic and apochromatic example optical systems.