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Laser diode feedback interferometer for stabilization and displacement measurements.

T Yoshino, M Nara, S Mnatzakanian

    Applied Optics
    |May 11, 2010
    PubMed
    Summary

    Active laser diode interferometers use feedback for precise displacement measurement. This study shows they achieve high precision (10-60 nm) over a wide dynamic range (8-9 micrometers).

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    Area of Science:

    • Optics and Photonics
    • Precision Measurement
    • Laser Technology

    Background:

    • Interferometry is crucial for precise measurements.
    • Laser diodes offer compact and stable light sources.
    • Active feedback systems can enhance interferometer performance.

    Purpose of the Study:

    • To investigate active laser diode interferometers for enhanced displacement measurement.
    • To analyze the performance of Twyman-Green and self-coupling configurations.
    • To explore the impact of feedback on measurement precision and range.

    Main Methods:

    • Utilized active laser diode interferometers with current feedback.
    • Implemented Twyman-Green and self-coupling interferometer designs.
    • Measured displacement over a dynamic range of 8-9 micrometers.

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  • Analyzed feedback signal behavior, including hysteresis and multistability.

    • Main Results:

    • Achieved displacement measurement precision of 10-60 nm.
    • Demonstrated a linear measurement scale over the tested dynamic range.
    • Observed hysteresis and multistable behavior in the feedback signal versus displacement, consistent with theoretical predictions.
    • The Twyman-Green interferometer achieved a stabilization factor exceeding 100.

    Conclusions:

    • Active laser diode interferometers provide a robust platform for high-precision displacement sensing.
    • The feedback mechanism effectively enhances measurement accuracy and dynamic range.
    • Observed nonlinear behaviors like hysteresis are predictable and manageable.