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Fabrication and Testing of Photonic Thermometers
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Temperature-compensated cryogenic Fabry-Perot cavity.

E K Wong, M Notcutt, C T Taylor

    Applied Optics
    |February 12, 2008
    PubMed
    Summary
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    This study demonstrates a Fabry-Perot cavity with minimal thermal expansion at low temperatures, achieved by compensating for differential thermal expansion between sapphire and fused silica. The design, validated by finite element modeling, offers precise temperature control for sensitive applications.

    Area of Science:

    • Physics
    • Materials Science
    • Optical Engineering

    Background:

    • Fabry-Perot cavities are crucial for precise measurements but are sensitive to temperature fluctuations.
    • Achieving a low coefficient of thermal expansion (CTE) in optical cavities, especially at low temperatures, is a significant engineering challenge.

    Purpose of the Study:

    • To design and demonstrate a Fabry-Perot cavity with an exceptionally low CTE at low temperatures.
    • To utilize differential thermal expansion between sapphire and fused silica for temperature compensation.

    Main Methods:

    • Designed a Fabry-Perot cavity using shaped fused silica mirrors and a sapphire spacer.
    • Employed finite element modeling to optimize the fused silica mirror geometry.
    • Measured the frequency temperature turning point and curvature of the fabricated cavity.

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    Main Results:

    • The designed cavity exhibited a low coefficient of thermal expansion at low temperatures.
    • The finite element model predicted a frequency temperature turning point of 16.6 K.
    • Experimental measurements confirmed a turning point of 16.2 K and a curvature of 6 x 10(-10) K(-2), consistent with the model.

    Conclusions:

    • Temperature compensation using differential thermal expansion of sapphire and fused silica is effective for creating low-CTE Fabry-Perot cavities.
    • The developed design and modeling approach provide a reliable method for achieving precise temperature stability in optical cavities.