Abstract

Laser-based techniques for combustion diagnostics are becoming increasingly important as they allow remote and non-intrusive measurements of flame parameters with high spatial and temporal resolution. Linear light scattering methods such as Laser Induced Fluorescence, Rayleigh and Raman scattering have been successfully applied [1]. In some situations non-linear processes such as coherent anti-Raman scattering (CARS) offer certain advantages over linear techniques. CARS is a four-wave mixing process and generates a signal in the form of a coherent beam of radiation but is suitable only for the detection of majority species [1]. Degenerate four-wave mixing (DFWM) is an important resonant technique which has been used to detect [2] and image [3] minority species in flames and also has the advantages inherent to a coherent process.

© 1996 Optical Society of America