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Related Concept Videos

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Related Experiment Video

Updated: Dec 27, 2025

Characterization of Surface Modifications by White Light Interferometry: Applications in Ion Sputtering, Laser Ablation, and Tribology Experiments
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Compact adaptive interferometer for unknown freeform surfaces with large departure.

Lei Zhang, Chen Li, Xiaolin Huang

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    |March 4, 2020
    PubMed
    Summary

    This study introduces a compact adaptive interferometer capable of measuring larger departures in freeform surfaces. By using cascaded deformable mirrors (DMs), it doubles the measurable non-symmetric departure to 80 µm.

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    Area of Science:

    • Optics and Optical Engineering
    • Metrology
    • Surface Characterization

    Background:

    • Adaptive interferometry is crucial for measuring freeform optics.
    • Current systems have limitations in measuring large, rotationally non-symmetric departures (around 20 µm).
    • Existing methods often require bulky setups and separate monitoring devices.

    Purpose of the Study:

    • To develop a compact adaptive interferometer for testing freeform surfaces with larger departures.
    • To enhance the measurement range for rotationally non-symmetric aberrations.
    • To integrate DM surface monitoring for a streamlined configuration.

    Main Methods:

    • Utilizing cascaded deformable mirrors (DMs) – a woofer and tweeter system.
    • Implementing a constrained decoupling control algorithm for aberration sharing.
    • Employing a time-division-monitoring (TDM) technique for DM surface monitoring.

    Main Results:

    • The cascaded DMs effectively double the measurable rotationally non-symmetric departure to approximately 80 µm.
    • The control algorithm successfully achieved average aberration sharing between DMs without coupling.
    • The TDM technique enabled a compact configuration by avoiding separate monitoring devices.
    • Measurements of a nearly flat freeform (~40 µm departure) and an off-axis paraboloid (~50 µm asymmetric departure) were successfully performed.

    Conclusions:

    • The developed compact adaptive interferometer significantly extends the capability for measuring freeform surfaces with large departures.
    • The cascaded DM approach with advanced control offers a robust solution for complex optical metrology.
    • Integrated TDM monitoring contributes to a more practical and compact interferometric system.