Microstructures formation on titanium plate by femtosecond laser ablation

Abstract

Microstructure formation of cone-like protrusions (CLP) on titanium (Ti) plate by the femtosecond laser ablation is reported. The number of the laser pulses to irradiate the Ti plate was varied from 10 to 230 at average laser fluence of 0.75 J/cm2 per pulse on the plate. The onset of CLP creation was observed with exposure of 70 pulses, and yielding CLP with a height from the bottom of the irradiation area of about 9 m after 230 pulses. The formation process of the CLP was found to depend on the laser produced periodic microstructures oriented parallel to the direction of the laser polarization vector.