Recent Progress in High-Speed Laser Spectroscopy for Combustion

Combustion in practical devices is inherently an unsteady process, characterized by turbulence of varying length and time scales. Hence, high spatio-temporal resolution is necessary for a better understanding of species transport and flame chemistry, as well as for model validation. For this reason, researchers in the field of laser diagnostics for combustion have endeavored to advance the state of the art in high-speed measurements for velocity, temperature, and chemical species concentrations. Dr. Meyer has worked on several advanced optical technologies throughout his career that help to make this feasible, including the use of ultrashort-pulse lasers for coherent anti-Stokes Raman scattering at kHz rates, the development of tunable diode lasers for molecular spectroscopy in the ultraviolet and mid-infrared at rates of 10's of kHz, and the use of high-power burst-mode lasers for wavelength-agile planar spectroscopy. The latter two approaches take advantage of new laser technologies and parametric conversion to excite molecules of interest in combustion science. Of particular interest is the generation of sufficient laser power at high laser repetition rate to allow planar imaging and spectroscopy with dynamic control over laser wavelength and tuning. These new technologies are discussed, along with opportunities for future advancements in the area high-speed laser spectroscopy for combustion.