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    Area of Science:

    • Optical physics
    • Precision measurement instrumentation

    Background:

    • Ring laser gyroscopes (RLGs) are susceptible to systematic errors.
    • Backscatter coupling between counterpropagating beams is a primary source of these errors, affecting rotation rate measurements.

    Purpose of the Study:

    • To analyze the origin of systematic errors in RLGs caused by backscatter coupling.
    • To develop a method for estimating and correcting these errors using optical frequency perturbations.

    Main Methods:

    • Theoretical analysis of optical frequency perturbations in passive and active ring cavities.
    • Modeling of double backscatter effects on beam phase and amplitude.
    • Demonstration using real-world RLG data.

    Main Results:

    • Systematic errors are directly related to independent optical frequency perturbations of counterpropagating beams.
    • Double backscatter leads to phase and amplitude modulations.
    • Rotation rate errors can be quantified and corrected via these modulations.

    Conclusions:

    • The proposed method effectively estimates and corrects systematic errors in RLGs.
    • Understanding optical frequency perturbations is key to improving RLG accuracy.
    • The technique is validated with experimental data.