Spectroscopic analyses during femtosecond laser ablation of hydroxyapatite

摘要

The plasma generated by ablation of hydroxyapatite Ca_(10)(PO_4)_6(OH)_2 with ultrashort laser pulses was studied in order to get a deeper insight in the fundamental mechanisms of the interaction of femtosecond laser pulses with the biocompatible target material. First, the propagation of the luminous plasma plume was observed using a fast ICCD camera while time-and space-resolved emission spectroscopy was employed to measure the plasma composition and its evolution as a function of time and space. It is shown that the kinetic energies of ablated atoms and ions are one order of magnitude smaller than those generated by hydroxypatite nanosecond laser ablation. Rather low temperatures of about 3500 and 2500 K are deduced from the relative intensity of spectral lines.