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Polarization Sagnac interferometer with postmodulation for gravitational-wave detection.

P T Beyersdorf, M M Fejer, R L Byer

    Optics Letters
    |December 13, 2007
    PubMed
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    A novel polarization Sagnac interferometer design enables signal detection at a reciprocal port and dark fringe. This robust, common-path system simplifies control and demonstrates resilience to laser fluctuations.

    Area of Science:

    • Optical interferometry
    • Precision measurement
    • Laser physics

    Background:

    • Traditional Sagnac interferometers face challenges with signal detection and environmental stability.
    • Common-path configurations offer inherent stability but can limit detection strategies.
    • Controlling polarization and minimizing optical losses are critical for sensitive measurements.

    Purpose of the Study:

    • To introduce a modified polarization Sagnac interferometer for enhanced signal detection.
    • To demonstrate a robust and easily controllable interferometric scheme.
    • To analyze and experimentally verify optical losses due to intraloop birefringence.

    Main Methods:

    • Implementation of a polarization Sagnac interferometer with an in-loop half-wave plate.

    Related Experiment Videos

  • Utilizing postmodulation and balanced heterodyne detection for signal recovery.
  • Employing common-path and collinear signal/local oscillator configurations for stability.

    • Main Results:

    • Successful signal detection at the reciprocal port while maintaining dark fringe operation.
    • Demonstrated robustness against laser amplitude and frequency fluctuations.
    • Quantified and experimentally verified optical loss caused by intraloop birefringence.

    Conclusions:

    • The proposed polarization Sagnac interferometer offers a simple, stable, and versatile platform for optical measurements.
    • The design effectively mitigates common noise sources, enhancing signal recovery.
    • Understanding and accounting for intraloop birefringence is essential for optimizing system performance.