Broadband D2 Coherent Anti-Stokes Raman Spectroscopy for Single-Shot Pressure and Temperature Determination Using a Fabry-Perot Etalon
W D. Gillespie, J W. Hahn, Walter J. Bowers Jr., Wilbur S. Hurst, G J. Rosasco
A method has been demonstrated that employs a Fabry-Perot etalon to spatially modulate a broadband coherent anti-Stokes Raman spectroscopy (CARS) signal beam to obtain enhanced resolution and spectral information for single-shot measurements of pressure and temperature. Resulting images are analyzed by: first, fits to Fabry-Perot patterns for single rovibrational lines, second, a lineshape analysis for a single rovibrational line, and third, a mapping of the Fabry-Perot channel spectra to a linear spectrum. Measurements of the D2 Raman Q-branch lines were made for a D2 in Ar mixture to take advantage of the large pressure shift and rovibrational line spacing. Peaks have been located to better than 0.5% of the free spectral range (FSR) of the etalon (about 0.01 cm-1) and a quantitative analysis of the pressure shifting and broadening has been determined for the range 1 MPa to 10 MPa. Finally, temperature and pressure determination using a bandfitting analysis has been demonstrated.
CARS, deuterium, line broadening, line shifting, Raman spectroscopy, single-shot pressure and temperature
, Hahn, J.
, Bowers Jr., W.
, Hurst, W.
and Rosasco, G.
Broadband D<sub>2</sub> Coherent Anti-Stokes Raman Spectroscopy for Single-Shot Pressure and Temperature Determination Using a Fabry-Perot Etalon, Applied Optics
(Accessed December 1, 2023)