Wavelength influence on nitrogen insertion into titanium by nanosecond pulsed laser irradiation in air

► Nitrogen insertion into titanium by VIS and IR laser irradiation in air was studied. ► VIS lasers (532 nm) showed a lower efficiency for nitrogen insertion than IR lasers. ► Threshold conditions (irradiance vs. number of shots) for N insertion were found. ► Oxygen was also found in the surface layers with a shorter insertion depth than nitrogen.