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Scanning technique for obtaining linear fringe shift readout from a high resolution interferometer.

R L Boxman, M L Sloan

    Applied Optics
    |March 6, 2010
    PubMed
    Summary

    This study presents a novel technique for linear readout of fringe shift in Fabry-Perot interferometers. The method ensures unambiguous and finesse-independent measurements using standard laboratory equipment.

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    Area of Science:

    • Optics and Photonics
    • Interferometry
    • Measurement Science

    Background:

    • Fabry-Perot interferometers are crucial for high-resolution spectral analysis.
    • Traditional fringe shift readout methods can be ambiguous and dependent on interferometer finesse.
    • A need exists for a simplified, robust, and unambiguous fringe shift measurement technique.

    Purpose of the Study:

    • To develop a technique for obtaining a linear readout of fringe shift from a high-resolution Fabry-Perot interferometer.
    • To demonstrate that this readout is unambiguous and independent of interferometer finesse.
    • To utilize standard laboratory equipment for the measurement process.

    Main Methods:

    • One mirror of the Fabry-Perot interferometer is mounted on a piezoelectric crystal driven by a high-frequency sinusoidal voltage.
    • Mirror displacement is displayed on an oscilloscope's Y-axis, while the X-axis is time-swept.
    • Pulses generated at transmission maxima are fed to the oscilloscope's Z-axis, creating intensified dots.

    Main Results:

    • A row of intensified dots is produced on the oscilloscope display.
    • The displacement of these dots from their ambient position is linearly proportional to the fringe shift.
    • The technique provides an unambiguous readout independent of the interferometer's finesse.

    Conclusions:

    • The described technique offers a linear, unambiguous, and finesse-independent readout of fringe shift.
    • The method effectively utilizes the internal circuitry of a standard laboratory oscilloscope.
    • This approach simplifies fringe shift measurement in high-resolution Fabry-Perot interferometry.