title: Broadband D2 coherent anti-stokes Raman spectroscopy for single-shot pressure and temperature determination with a Fabry-Perot etalon.
abstract: A method is demonstrated that employs a Fabry-Perot etalon to modulate a broadband coherent anti-Stokes Raman spectroscopy signal beam spatially 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 line-shape analysis for a single rovibrational line; and third, a mapping of the Fabry-Perot channel spectra to a linear spectrum. Measurements of the D(2) Raman Q-branch lines were made for a D(2) in Ar mixture to take advantage of the large pressure shift and rovibrational line spacing. Peaks are located to better than 0.5% of the free spectral range of the etalon (approximately 0.01 cm(-1)) and a quantitative analysis of the pressure shifting and broadening is determined for the 1-10-MPa range. Finally, temperature and pressure determination using a band-fitting analysis is demonstrated.
authors.affiliation: Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544, USA.
authors.forename: W D
authors.initials: WD
authors.lastname: Gillespie
authors.forename: J W
authors.initials: JW
authors.lastname: Hahn
authors.forename: W J
authors.initials: WJ
authors.lastname: Bowers
authors.forename: W S
authors.initials: WS
authors.lastname: Hurst
authors.forename: G J
authors.initials: GJ
authors.lastname: Rosasco