Resolved rotation–vibration non-equilibrium with rotational VIPA-CARS

Simultaneous rotational and vibrational temperatures are measured in an N 2 plasma with rotational coherent anti-Stokes Raman scattering (CARS) resolved with a virtually imaged phased array (VIPA)-based spectrometer. A VIPA spectrally separates rotational transitions for each vibrational state, allo...

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Bibliographic Details
Published in:Optics letters 2022-10, Vol.47 (20), p.5429-5432
Main Authors: Steinmetz, S. A., Chen, T. Y., Goldberg, B. M., Limbach, C. M., Kliewer, C. J.
Format: Article
Language:English
Subjects:
Coherent scattering
Nitrogen plasma
Phased arrays
Raman spectra
Rotational spectra
Vibration measurement
Vibrational states
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Summary:Simultaneous rotational and vibrational temperatures are measured in an N 2 plasma with rotational coherent anti-Stokes Raman scattering (CARS) resolved with a virtually imaged phased array (VIPA)-based spectrometer. A VIPA spectrally separates rotational transitions for each vibrational state, allowing vibrational populations to be directly measured. VIPA-CARS is shown to provide more accurate measurements of non-equilibrium temperatures than grating-resolved rotational CARS. The general characteristics, limitations, and potential uses of VIPA-CARS are discussed.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.474037