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Accurate interferometric retardance measurements.

K B Rochford, C M Wang

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    |February 9, 2008
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    This study presents a precise method for measuring optical retardance using a specialized Michelson interferometer. The improved system achieves high accuracy, with measurement uncertainties as low as 0.039 degrees for optical retarders.

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    Area of Science:

    • Optical Physics
    • Metrology

    Background:

    • Accurate measurement of optical retardance is crucial for various photonic applications.
    • Existing interferometric methods can be limited by system imperfections and data processing challenges.

    Purpose of the Study:

    • To develop and validate a high-precision method for measuring the retardance of optical devices.
    • To quantify the uncertainty associated with the improved measurement system.

    Main Methods:

    • Utilized a two-polarization Michelson interferometer with a low-retardance beam splitter.
    • Implemented digital signal processing for enhanced data analysis.
    • Conducted error analysis of the optical system and measurement procedures.

    Main Results:

    • Achieved a measurement uncertainty of 0.039 degrees for 90-degree retarders.
    • Identified retardance variations from coherent reflections, adding 0.005 to 0.03 degrees uncertainty.
    • Determined a combined measurement uncertainty of up to 0.049 degrees.

    Conclusions:

    • The developed interferometric system offers a highly accurate method for optical retardance measurement.
    • Coherent reflections introduce a quantifiable source of error that must be considered.
    • The system's precision is suitable for applications requiring precise optical characterization.