Optimizing hybrid rotational femtosecond/picosecond coherent anti-Stokes Raman spectroscopy in nitrogen at high pressures and temperatures

摘要: 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 interacts with narrow-bandwidth, frequency-upconverted 5.5 ps cell containing $ {{\rm{N}}_{{2}}} $N2 1–70 atm temperatures 300–1000 K. computational code is used to model spectra fit experimental results obtain best-fit good qualitative fits well accuracy precision between thermocouple measured over explored pressure regimes. The overall average percentage difference - {{0}}.{{3}}\% $−0.3% standard deviation 7.1%, showing suitability HR-CARS characterizing high-pressure -temperature environments.