OH planar laser-induced fluorescence imaging system using a kilohertz-rate 283 nm UV Ti:sapphire laser.

Abstract

A narrow linewidth Ti:sapphire laser is developed and characterized for the generation of an ultraviolet nanosecond laser pulses for the planar laser-induced fluorescence (PLIF) imaging of hydroxyl (OH). With a pump power of 11.4W at 1kHz, the Ti:sapphire laser produces 3.5mJ at 849nm with pulse duration of 17ns and achieves a conversion efficiency of 28.2%. Accordingly, its third-harmonic generation outputs 0.56mJ at 283nm in BBO with type I phase match. An OH PLIF imaging system has been built; a 1 to 4kHz fluorescent image of OH of a propane Bunsen burner has been captured based on this laser system.