Application of laser spectroscopy in nuclear engineering; Effect of focusing condition on laser ablation plume

Oba, Masaki; Miyabe, Masabumi; Akaoka, Katsuaki; Wakaida, Ikuo

no journal, , 

Ablation plume of oxide samples of gadolinium was observed by means of laser-induced fluorescence imaging technique for varying the beam focal point. The observed plume was vertically expanded when the focal point was far from the sample surface; in contrast, it varied to be hemispherical shape when the focal point was on the sample surface. In addition, the internal plume structure and the composition of the ablated atomic and ionic species were also varied significantly.