RESUMEN
The electronic excitation of key combustion species or flow tagging of chemical species requires a narrowband tunable UV source. In this work, a potassium titanyl phosphate (KTP) burst-mode optical parametric oscillator (OPO) pumped by a 532â nm laser is developed to generate a spectrally narrow signal and an idler output with 1.48 ± 0.19â cm-1 bandwidth without the need for injection seeding. The idler (1410-1550â nm range) is further mixed with 355 or 266â nm to generate 284 or 226â nm for OH or NO planar laser-induced fluorescence (PLIF), respectively, with up to 1.9% conversion efficiency from 1064â nm to the UV. MHz-rate burst profiles are reported, and OH and NO PLIF are demonstrated in a rotating detonation combustor at rates up to 200â kHz.