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Related Experiment Video

Updated: Jun 11, 2026

Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects
10:16

Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects

Published on: February 8, 2014

Automatic design of off-axis reflective HUD systems based on multi-field SCE and the LM algorithm.

PengShuo Fu, ChengXiang Fan, WenJun Lu

    Applied Optics
    |June 10, 2026
    PubMed
    Summary

    This study introduces an automated workflow for designing complex off-axis freeform reflective optical systems. The method effectively minimizes distortion and improves image quality for applications like vehicle head-up displays (HUDs).

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    Area of Science:

    • Optical Engineering
    • Freeform Optics Design
    • Advanced Metrology

    Background:

    • Freeform optical elements are crucial in modern optical systems due to fabrication advancements.
    • Automated design of off-axis freeform reflective systems is challenging due to coupled aberrations and high-dimensional design spaces.

    Purpose of the Study:

    • To develop an automated workflow for designing off-axis freeform reflective systems under multi-field constraints.
    • To address the difficulties in designing systems with coupled aberrations and high-dimensional design spaces.

    Main Methods:

    • Combines multi-field seed-curve extension with constrained nonlinear least-squares refinement.
    • Initial freeform geometry constructed under global field constraints for desired ray mapping.
    • Levenberg-Marquardt algorithm used for optimizing freeform coefficients to enhance image quality and control distortion.

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    Measuring Spatially- and Directionally-varying Light Scattering from Biological Material
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    Measuring Spatially- and Directionally-varying Light Scattering from Biological Material

    Published on: May 20, 2013

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    Last Updated: Jun 11, 2026

    Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects
    10:16

    Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects

    Published on: February 8, 2014

    Measuring Spatially- and Directionally-varying Light Scattering from Biological Material
    11:57

    Measuring Spatially- and Directionally-varying Light Scattering from Biological Material

    Published on: May 20, 2013

    Main Results:

    • Successfully designed a vehicle head-up display (HUD) system.
    • Achieved maximum distortion below 3% and Modulation Transfer Function (MTF) above 0.3 at 6 lp/mm across the full eye box.
    • Validated the design using Zemax OpticStudio.

    Conclusions:

    • The proposed automated workflow is effective for HUD design.
    • The method shows promise for similar off-axis reflective imaging systems.
    • Advances in freeform optics design are enabling practical applications.