Eere, we studied the plasma ejected by pulsed laser ablation of YBaCuO superconductor pellet. Optical fibre is used to sample the plasma spectra, which arc detected and recognized with an OSA system. Then, we use optical fibre and a monoshrometer to trace the recognized particles. The time-of-flight spectra at various distance from the target surfnce was measured and the variation of spectrum intensity versus the distance obtained. Analyses of the results are presented.