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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Published on: September 5, 2019

New common-path phase shifting interferometer using a polarization technique.

H Kadono, N Takai, T Asakura

    Applied Optics
    |May 11, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A novel common-path phase shifting interferometer utilizes polarization techniques for precise surface structure analysis. This advanced optical instrument achieves high stability and accuracy, making it ideal for detailed 2-D phase measurements of small objects.

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    Area of Science:

    • Optical Physics
    • Metrology
    • Interferometry

    Background:

    • Traditional interferometers can suffer from environmental instabilities.
    • Common-path designs offer improved stability by ensuring both beams travel similar paths.
    • Polarization techniques provide a robust method for phase manipulation in optical systems.

    Purpose of the Study:

    • To propose and discuss a new common-path phase shifting interferometer.
    • To leverage polarization for phase shifting in an interferometer.
    • To enable direct 2-D phase analysis of object surfaces.

    Main Methods:

    • A common-path interferometer design using polarization for phase shifting.
    • Separation of the direct current (dc) component as a reference beam in the Fourier transform plane.
    • Utilizing a 2-D detector (e.g., TV camera) for intensity variation acquisition.
    • Direct analysis of phase distribution from intensity data.

    Main Results:

    • High stability in phase measurements, achieving up to lambda/200.
    • Accurate phase measurements with an accuracy of lambda/40.
    • Successful verification of the interferometer's validity through experiments.

    Conclusions:

    • The developed phase shifting interferometer offers high stability and accuracy for optical measurements.
    • It is well-suited for obtaining 2-D phase information on the surface structure of small objects.
    • The polarization-based common-path design represents a significant advancement in phase shifting interferometry.