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Updated: May 5, 2026

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements
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Electro-optic frequency comb Doppler-broadening thermometry.

Sean M Bresler, Erin M Adkins, Stephen P Eckel

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    Summary
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    Chirped electro-optic frequency comb (EOFC) spectroscopy offers accurate Doppler-broadening thermometry for 85Rb vapor. This method overcomes limitations of conventional techniques, enabling precise temperature measurements for industrial applications.

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    Area of Science:

    • Atomic Physics
    • Spectroscopy
    • Metrology

    Background:

    • Doppler-broadening thermometry is crucial for precise temperature measurements.
    • Conventional methods using single-frequency lasers suffer from systematic errors like transit-induced optical pumping distortion.
    • Alkali atom vapor thermometry requires robust and accurate techniques.

    Purpose of the Study:

    • To demonstrate and validate Doppler-broadening thermometry using a chirped electro-optic frequency comb (EOFC).
    • To compare the performance of direct EOFC spectroscopy against conventional Doppler spectroscopy.
    • To assess the potential of EOFC thermometry for primary thermometer applications.

    Main Methods:

    • Direct optical frequency comb spectroscopy of 85Rb vapor using a chirped EOFC.
    • Experimental comparison with conventional Doppler spectroscopy employing a single-frequency, step-scanned laser.
    • Optical Bloch equation simulations to analyze atomic lineshape distortions.

    Main Results:

    • Direct EOFC Doppler-broadening thermometry achieved high accuracy with approximately 1K statistical uncertainty.
    • EOFC spectroscopy effectively mitigated transit-induced optical pumping distortion, a key systematic error.
    • Simulations confirmed that higher optical power can be used with EOFC spectroscopy to reduce noise without distortion.

    Conclusions:

    • Direct EOFC spectroscopy presents a significant advancement in Doppler-broadening thermometry.
    • This technique overcomes major limitations of conventional alkali atom thermometry.
    • EOFC Doppler-broadening thermometry is a promising candidate for a primary thermometer suitable for industrial applications.