Abstract
This article reviews recent progress in diode-laser spectroscopy for combustion diagnostics and sensing. General advantages of diode laser as a light source for spectroscopic measurements, basic theory of absorption spectroscopy, example applications for combustion diagnostics in visible and near-infrared regions using telecommunication lasers and in mid-infrared and ultra-violet regions using newly developed laser sources are briefly reviewed, and likely directions for future research and development in the field are suggested.