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Optimal phase contrast in common-path interferometry.

J Glückstad, P C Mogensen

    Applied Optics
    |March 22, 2008
    PubMed
    Summary
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    We created a model to optimize common-path interferometers (CPIs) using spatial filtering. This framework enhances linearity and fringe accuracy, enabling unambiguous phase mapping.

    Area of Science:

    • Optical Engineering
    • Interferometry
    • Metrology

    Background:

    • Common-path interferometers (CPIs) are crucial for stable optical measurements.
    • Existing CPI designs may face limitations in linearity and fringe accuracy.
    • Spatial filtering offers potential for performance enhancement.

    Purpose of the Study:

    • To develop an analytical model for designing and optimizing CPIs using spatial filtering.
    • To establish a quantitative framework for characterizing CPI performance.
    • To investigate methods for improving linearity and fringe accuracy in CPIs.

    Main Methods:

    • Detailed mathematical analysis of spatial filtering in CPIs.
    • Application of the model to optimize various CPI configurations.

    Related Experiment Videos

  • Analytical treatment of synthetic reference wave curvature.
  • Proposal and analysis of a dual CPI system.

    • Main Results:

    • A graphical framework for quantitative CPI performance characterization was developed.
    • Optimization strategies were identified to improve linearity and fringe accuracy.
    • The effect of synthetic reference wave curvature was analyzed in detail.
    • A dual CPI system demonstrated unambiguous phase-to-intensity mapping.

    Conclusions:

    • The developed analytical model provides a robust tool for CPI design and optimization.
    • Spatial filtering modifications can significantly enhance interferometer linearity and fringe accuracy.
    • The proposed dual CPI system offers a solution for unambiguous phase measurement across the full range.