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Related Experiment Video

Updated: Jun 16, 2026

Fabrication of a Low-Cost, Fiber-Coupled, and Air-Spaced Fabry-Pérot Etalon
07:22

Fabrication of a Low-Cost, Fiber-Coupled, and Air-Spaced Fabry-Pérot Etalon

Published on: February 3, 2023

Feedback stabilized fabry-perot interferometer.

G Hernandez, O A Mills

    Applied Optics
    |February 4, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study presents a novel method for stabilizing a Fabry-Perot interferometer, ensuring both wavelength and parallelism stability. The technique uses feedback control to maintain high precision for extended periods, enabling simultaneous data acquisition.

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    Area of Science:

    • Optical Physics
    • Metrology
    • Interferometry

    Background:

    • Fabry-Perot interferometers are crucial for high-resolution spectroscopy.
    • Maintaining precise wavelength and etalon parallelism is critical for accurate measurements.
    • Existing methods often struggle with simultaneous stabilization and continuous operation.

    Purpose of the Study:

    • To develop a method for simultaneously stabilizing a Fabry-Perot interferometer's wavelength and the parallelism of its optical flats.
    • To achieve high-precision, time-invariant stabilization for enhanced instrument performance.
    • To enable continuous data acquisition during the stabilization process.

    Main Methods:

    • Utilizing three auxiliary spectral sources to generate correcting signals.

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    Fabrication of a Low-Cost, Fiber-Coupled, and Air-Spaced Fabry-Pérot Etalon
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    Published on: February 3, 2023

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  • Measuring fringe maxima displacement relative to a fixed reference point.
  • Employing a feedback loop to a piezoelectric drive for real-time adjustments.

    • Main Results:

    • Achieved stability near lambda/1000 at 546 nm over a 6-hour period.
    • Demonstrated simultaneous stabilization of wavelength and parallelism.
    • Identified surface defects of flats as the primary limitation for etalon parallelism.

    Conclusions:

    • The described method effectively stabilizes Fabry-Perot interferometers for precise measurements.
    • Continuous self-correction allows for simultaneous stabilization and data taking.
    • Further improvements in optical flat quality are needed to fully realize the method's potential.