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Related Experiment Video

Updated: Sep 30, 2025

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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Dynamic Fizeau interferometer with assistant defocused source.

Mingliang Duan, Jianxin Li, Yi Zong

    Optics Letters
    |March 15, 2022
    PubMed
    Summary

    This study introduces a dynamic Fizeau interferometer (DFI) for precise measurements during vibration. The novel method uses two passes to accurately analyze interference patterns, overcoming common challenges in optical metrology.

    Area of Science:

    • Optical Metrology
    • Interferometry
    • Precision Measurement

    Background:

    • Traditional Fizeau interferometers struggle with precision measurements in environments with severe vibration.
    • Phase ambiguity and sign correction are persistent challenges in interferometric data analysis.

    Purpose of the Study:

    • To develop and demonstrate a dynamic Fizeau interferometer (DFI) capable of high-precision measurements under severe vibration.
    • To introduce a novel two-pass method for accurate phase extraction and sign correction in Fizeau interferometry.

    Main Methods:

    • The proposed method employs two interferometric passes: a null-interference pass (NP) and a circular carrier-frequency pass (CP).
    • The NP utilizes an on-axis Fizeau design for common-path preservation.
    • The CP uses an assistant defocused source to generate circular fringe patterns for phase extraction and sign correction.

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    Main Results:

    • Experimental demonstration confirms the feasibility and performance of the proposed dynamic Fizeau interferometer.
    • The method successfully demodulates null-fringe patterns and corrects phase-sign ambiguity.

    Conclusions:

    • This work presents the first general asynchronous phase-shifting dynamic Fizeau interferometer.
    • The DFI maintains the common-path advantages of Fizeau interferometers while enabling high-precision measurements under vibration.