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Related Experiment Video

Updated: Feb 11, 2026

Implementation of a Reference Interferometer for Nanodetection
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Pure adaptive interferometer for free form surfaces metrology.

Lei Zhang, Sheng Zhou, Dong Li

    Optics Express
    |May 3, 2018
    PubMed
    Summary

    A novel adaptive interferometer measures free-form surfaces and deformable mirror (DM) surfaces simultaneously. This optical metrology technique eliminates the need for auxiliary devices, simplifying complex measurements.

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    Area of Science:

    • Optical Metrology
    • Interferometry
    • Free-form Optics

    Background:

    • Metrology of free-form optical surfaces is challenging and often requires complex auxiliary systems.
    • Simultaneous monitoring of deformable mirror (DM) surfaces alongside free-form surface measurement is not standard.
    • Existing methods for DM monitoring, such as wavefront sensors and deflectometry, add complexity and cost.

    Purpose of the Study:

    • To propose a novel pure adaptive interferometer for simultaneous optical metrology of free-form surfaces and DM surfaces.
    • To eliminate the need for auxiliary devices like wavefront sensors and deflectometry systems for DM monitoring.
    • To achieve both DM surface monitoring and free-form surface measurement within a single interferometer setup.

    Main Methods:

    • A pure adaptive interferometer design is presented.
    • Polarizing optics divide the interferometer into two partial common path systems.
    • One system performs a null test for the free-form surface, while the other performs a non-null test for the DM surface.
    • Ray tracing is employed to extract the final figure error of the free-form surface.

    Main Results:

    • The proposed interferometer enables simultaneous measurement of free-form surfaces and DM surfaces.
    • The system successfully integrates DM surface monitoring and free-form surface metrology into a single interferometer.
    • Experimental results demonstrate the feasibility of the proposed adaptive interferometer for optical metrology applications.

    Conclusions:

    • The developed pure adaptive interferometer offers a simplified and efficient approach to optical metrology for free-form surfaces.
    • Simultaneous measurement capability reduces complexity and eliminates the need for additional metrology equipment.
    • This method provides a viable solution for precise characterization of optical components in advanced optical systems.