Laser-induced fluorescence (LIF) and two-dimensional laser-induced fluorescence were used for measurement of the fluorescence lifetime of the A<sup>1</sup>Σ<sup>+</sup> state of BaO molecules in the laser-ablation process of BaTiO<sub>3</sub> and YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7–x</sub> in the oxygen background gas. The zero-pressure lifetime and the quenching rate were also determined as τ<sub>0</sub>=357ns and k=5.1 × 10<sup>-6</sup>ns<sup>-1</sup>mTorr<sup>-1</sup> , respectively. The spatiotemporal changes of the collisional quenching of BaO molecules were successfully visualized, and the influence of the quenching on the spatial distribution imaging of BaO molecule was corrected.
© 1999 Optical Society of America
Yoshiki Nakata, Tatsuo Okada, and Mitsuo Maeda, "Correction of the quenching effect in two-dimensional laser-induced fluorescence measurement of laser-ablation processes," Opt. Lett. 24, 1765-1767 (1999)