Journal
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
Volume 37, Issue 4, Pages 1035-1046Publisher
OPTICAL SOC AMER
DOI: 10.1364/JOSAB.383575
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Funding
- U.S. Department of Energy's Office of Science Early Career Research Program
- European Research Council (ERC) [759546]
- U.S. Department of Energy's National Nuclear SecurityAdministration [DE-NA0003525]
- European Research Council (ERC) [759546] Funding Source: European Research Council (ERC)
- EPSRC [EP/P001661/1] Funding Source: UKRI
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We demonstrate the use of hybrid rotational femtosecond/picosecond (fs/ps) coherent anti-Stokes Raman spectroscopy (HR-CARS) as a technique for temperature measurements in nitrogen gas at high pressures and temperatures. A broadband pulse shaper-adjusted 42 fs pulse interacts with a narrow-bandwidth, frequency-upconverted 5.5 ps pulse in a cell containing N-2 at pressures of 1-70 atm and temperatures of 300-1000 K. A computational code is used to model spectra and fit experimental results to obtain best-fit temperatures. We demonstrate good qualitative fits as well as good accuracy and precision between thermocouple measured and best-fit temperatures over the explored pressure and temperature regimes. The overall average percentage temperature difference between thermocouple measurements and best-fit temperatures is -0.3% with a standard deviation of 7.1%, showing the suitability of HR-CARS for characterizing high-pressure and -temperature environments. (C) 2020 Optical Society of America
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