Abstract
The present paper addresses laser ignition using a dual pulse pre-ionization technique. The approach uses an initial ultraviolet (UV) laser pulse at 266 nm to provide pre-ionization (but not full breakdown) along with an overlapped near-infrared (NIR) pulse at 1064 nm to add energy to the pre-ionized gas. Experiments to characterize the UV pre-ionization and pulse overlap are conducted in atmospheric pressure air. Rayleigh scattering is used to measure the air temperature in the focal region of the pulses. At intensities slightly lower than the breakdown threshold, the UV pulse increases the air temperature from ~295 K to ~600 K. Overlapping of the NIR pulse provides additional temperature increase of 10s of Kelvin. The UV pulse is also observed to create weak optical emission from the focal volume even at intensities below the breakdown threshold.
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