Spectrally Isolating Rotational Raman Lines of CO2: An Experimental Demonstration of the High Resolution of Slow Light Imaging Spectroscopy

Amirhossein Abbasszadehrad, Jason Meyers, Kevin Brown, Junhwi Bak, James Creel, Arthur Dogariu, Richard Miles

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this study, we experimentally demonstrate the high resolution of slow light imaging spectroscopy by measuring the spectrum of narrowly-spaced (93.6 GHz) rotational Raman lines of CO2 in 1 atm at room temperature. Raman spectroscopy of the gas phase is a laser diagnostic technique for measuring important parameters in aerospace applications. Results show that adjacent anti-Stokes lines of J22 and J24 can be completely isolated as no wing overlap is present. The total FWHM of Raman lines is measured to be about 18 to 20 GHz which is due to the collisional and thermal broadening of the Raman lines, the linewidth of the laser, the temporal profile of the intensifier gain, and the instrument function of the method. We characterize the combined effect of the instrument function, the laser linewidth, and the intensifier gain curve on the measurement of rotational Raman lines.

Original languageEnglish (US)
Title of host publicationAIAA SciTech Forum and Exposition, 2024
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624107115
DOIs
StatePublished - 2024
EventAIAA SciTech Forum and Exposition, 2024 - Orlando, United States
Duration: Jan 8 2024Jan 12 2024

Publication series

NameAIAA SciTech Forum and Exposition, 2024

Conference

ConferenceAIAA SciTech Forum and Exposition, 2024
Country/TerritoryUnited States
CityOrlando
Period1/8/241/12/24

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering

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