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Robust one-beam interferometer with phase-delay control.

J A Ferrari, E M Frins, D Perciante

    Optics Letters
    |December 15, 2007
    PubMed
    Summary
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    A novel one-beam interferometer offers precise phase-delay control using wave-front division. This design enables advanced phase-stepping interferometry techniques for enhanced optical measurements.

    Area of Science:

    • Optics and Photonics
    • Interferometry
    • Wavefront Division

    Background:

    • Traditional interferometers like the Mach-Zehnder often use amplitude division.
    • Controlling phase delay externally can be complex in existing setups.
    • Wavefront division interferometry offers an alternative approach.

    Purpose of the Study:

    • To describe a robust one-beam interferometer with external phase-delay control.
    • To present a wavefront division interferometer design.
    • To enable phase-stepping interferometry techniques.

    Main Methods:

    • A one-beam interferometer design is proposed, consolidating both arms into a single collimated beam.
    • External phase-delay control is achieved at the interferometer output.

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  • Components include polarizing beam splitters, a quarter-wave plate, a Faraday rotator, and a polarizer.

    • Main Results:

    • The device functions as a wavefront division interferometer, not an amplitude-division one.
    • Phase delay is controlled externally via electrical current in the Faraday rotator or polarizer rotation.
    • Topological phase shifts can be introduced by polarizer rotation.

    Conclusions:

    • The described one-beam interferometer provides a robust platform for precise phase control.
    • The external phase-delay mechanism facilitates phase-stepping interferometry.
    • This design offers a novel approach to wavefront division interferometry.