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The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements
Published on: December 5, 2025
353
Cavity-Enhanced Doppler-Broadening Thermometry via All-Frequency Metrology.
Qi Huang1, Jin Wang2, Rui-Heng Yin1
1University of Science and Technology of China, Hefei National Research Center for Physical Sciences at the Microscale, Hefei 230026, China.
Physical Review Letters
|December 12, 2025
Summary
This study introduces a precise Doppler broadening thermometry (DBT) method using all-frequency-domain measurements. The technique achieves high accuracy for temperature measurements, advancing quantum thermometry and molecular physics research.
Area of Science:
- Quantum physics
- Spectroscopy
- Thermometry
Background:
- Doppler broadening thermometry (DBT) is a technique for measuring temperature.
- Previous DBT methods faced challenges with line-shape models and pressure effects.
- High-finesse optical cavities offer enhanced spectroscopic resolution.
Purpose of the Study:
- To demonstrate a novel Doppler broadening thermometry (DBT) approach using all-frequency-domain measurements.
- To achieve high-precision temperature measurements with suppressed systematic errors.
- To resolve challenges in DBT related to line-shape models and pressure dependence.
Main Methods:
- Utilized the R(10) transition of carbon monoxide (CO) at 1567 nm.
- Employed a high-finesse optical cavity with a narrow mode width (0.6 kHz).
- Performed global Voigt-profile analysis on Doppler profiles obtained across 2-17 Pa pressures.
Main Results:
- Achieved high signal-to-noise ratios for Doppler profiles.
- Temperatures measured deviated by only -2.0±3.6 mK from calibrated thermometers.
- Systematic errors were suppressed below 9 ppm.
- Demonstrated negligible dependence on line-shape models when accounting for pressure effects.
Conclusions:
- The developed DBT method offers a new paradigm for quantum-based thermometry.
- This technique provides a precision platform for investigating molecular collision physics.
- The study resolves a long-standing challenge in Doppler broadening thermometry regarding line-shape models.
