Dynamic and sensitive hybrid fs/ps vibrational CARS thermometry using a quasi-common-path second-harmonic bandwidth-compressed probe

We demonstrate a 1-kHz, single-shot, dynamic, and sensitive flame temperature measurement using hybrid femtosecond/picosecond vibrational coherent anti-Stokes Raman scattering. This benefits from a 7-cm−1, 240-μJ, and sideband-free picosecond pulse out of a broadband 35-fs pulse through a quasi-comm...

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Bibliographic Details
Published in:Applied physics letters 2021-02, Vol.118 (7)
Main Authors: Zhao, Huijie, Tian, Ziyang, Wu, Tao, Li, Yan, Wei, Haoyun
Format: Article
Language:English
Subjects:
Applied physics
Broadband
Coherent scattering
Flame temperature
Raman spectra
Temperature measurement
Thermometers
Thermometry
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Summary:We demonstrate a 1-kHz, single-shot, dynamic, and sensitive flame temperature measurement using hybrid femtosecond/picosecond vibrational coherent anti-Stokes Raman scattering. This benefits from a 7-cm−1, 240-μJ, and sideband-free picosecond pulse out of a broadband 35-fs pulse through a quasi-common-path second harmonic bandwidth compressor system. Measurements around optimal time delay exhibit superior performance with a temperature inaccuracy of less than 1% and a precision of ∼2% at 1790 K. These results demonstrate the advantages and potential for the accurate and fast temperature measurement in practical or harsh environments.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0036303