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Related Experiment Video

Updated: Jun 10, 2026

Fabrication of a Low-Cost, Fiber-Coupled, and Air-Spaced Fabry-Pérot Etalon
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Cryogenic far-infrared Fabry-Perot étalon.

D B Peterson, H M Pickett

    Applied Optics
    |August 19, 2010
    PubMed
    Summary

    A novel cryogenic Fabry-Perot étalon was developed for far-infrared spectroscopy. This instrument utilizes freestanding metal meshes, achieving high spacing precision (1 part in 10^6) upon cooling for advanced optical applications.

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    Area of Science:

    • Optics and Photonics
    • Cryogenic Engineering
    • Far-Infrared Spectroscopy

    Background:

    • Fabry-Perot etalons are crucial for high-resolution spectroscopy.
    • Cryogenic operation is often required for far-infrared applications to reduce thermal noise.
    • Traditional etalon designs may face challenges with thermal stability and precision at cryogenic temperatures.

    Purpose of the Study:

    • To design and fabricate a compact cryogenic Fabry-Perot étalon for the far-infrared spectral region.
    • To investigate the use of freestanding metal meshes as reflective elements in a cryogenic etalon.
    • To assess the precision and stability of the etalon's spacing under repeated cooling cycles.

    Main Methods:

    • Fabrication of a small cryogenic Fabry-Perot étalon.
    • Utilization of freestanding gold-coated copper mesh on stainless steel as reflecting elements.
    • Implementation of precise alignment and calibration procedures for cryogenic operation.

    Main Results:

    • Successful fabrication of a cryogenic Fabry-Perot étalon.
    • Demonstrated reproduction of etalon spacing to 1 part in 10^6 with repeated cooling.
    • Characterization of the étalon's optical properties and performance at cryogenic temperatures.

    Conclusions:

    • The developed cryogenic Fabry-Perot étalon is suitable for far-infrared applications.
    • Freestanding metal meshes provide a viable and precise reflective solution for cryogenic etalons.
    • The fabrication and calibration methods ensure high accuracy and repeatability for spectroscopic measurements.

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