Abstract
Doppler-broadening thermometry (DBT) can be used as a calibration-free primary reference suitable for practical applications, e.g. reliably measuring temperatures over long periods of time in environments where sensor retrieval is impractical. We report on our proof-of-concept investigations into DBT with alkali metal vapour cells, with a particular focus on both absorption and frequency accuracy during scans. We reach sub-kelvin temperature accuracy, and experimental absorption fit residuals below $0.05\,\%$, in a simple setup. The outlook for portable, practical devices is bright, with clear prospects for future improvement.
| Original language | English |
|---|---|
| Journal | Philosophical Transactions of the Royal Society A: Mathematical Physical and Engineering Sciences |
| DOIs | |
| Publication status | Accepted/In press - 22 Jul 2025 |
Funding
We are grateful for insightful discussions with Livio Gianfrani, careful reviewing by Sonja Franke Arnold and Aldo Mendieta, and support via Engineering and Physical Sciences Research Council EP/T001046/1, EP/X525017/1; and National Physical Laboratory/EPSRC studentships 2749424 and 2931764.
Keywords
- physics.atom-ph
- quant-ph
- primary thermometry
- photonic thermometry
- Doppler broadening
- atomic spectroscopy
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Data for: "Practical primary thermometry via alkali-metal-vapour Doppler broadening"
Agnew, N. (Creator), Arnold, A. (Supervisor) & Vohnikova, V. (Contributor), University of Strathclyde, 5 Dec 2015
DOI: 10.15129/414c08c6-fee0-4af0-911d-ccdf41277bc8
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