title: Pulsed spontaneous Raman scattering technique for luminous environments.
abstract: A gated photon counting system, cavity-dumped argon-ion laser, and a multipass retroreflecting light cell have been combined in a system to enhance spontaneous Raman scattering in luminous background situations. Signal-to-background ratio (SBR) has been improved a factor of 450 over a single-pass cw system with cw power equal to the pulsed average power. The improvement attributable to the gating and cavity dumping the laser is a factor of 30. A factor of 15 improvement is due to the retroreflecting light cell. Temperature and density data obtained from N(2)Q-branch spectra of a luminous methane-air flame are presented to illustrate the utility of the system. A passband fitting technique is introduced to analyze the data.
authors.forename: A J
authors.initials: AJ
authors.lastname: Mulac
authors.forename: W L
authors.initials: WL
authors.lastname: Flower
authors.forename: R A
authors.initials: RA
authors.lastname: Hill
authors.forename: D P
authors.initials: DP
authors.lastname: Aeschliman