Surface modification of titanium nitride film by a picosecond Nd:YAG laser

Surface modifications of AISI 1045 steel created by high intensity 1064 and 532nm picosecond Nd:YAG laser pulses

“…These structures appear typically after accumulation of 50 laser pulses. The Oxides decrease-center, periphery PSS not registered PSS with periodicity of: (i) $5 and $2 mm on micrometre-scale; (ii) 371 nm on nanometre-scale periodicity of the structures obtained with the 532 nm laser agrees well with that obtained with the same laser, but two completely different materials, TiN film on silicone [24] and Ti6Al4V bulk [25].…”

“…For laser pulses with LRED values above the damage threshold, and duration longer than 10 ps (as in our case), the lateral thermal diffusivity as well as other heat effects cannot be neglected [16]. The heat affected zone (HAZ), calculated based on the equation [16,24] for given steel thermal diffusivity and laser pulse duration (40 ps), was about 40 nm. However, this value is not very realistic, since the HAZ equation holds for the conditions of low fluences (not sufficient for phase transformation), what is clearly not the case here.…”

Surface morphology modifications of titanium based implant induced by 40picosecond laser pulses at 266nm

“…doi:10.1016/j.jallcom.2010.04.047 The samples were irradiated by a Nd:YAG laser beam at a wavelength of 266 nm and 40 ps pulse. The laser was an active-passive mode-locked Nd:YAG system [27], model SYL P2 produced by QuantaSystem Srl.-Solbiate. It includes a laser oscillator, an amplifier and a non-linear crystal (KD × P).…”

Ultrafast Laser‐Induced Metasurfaces for Geometric Phase Manipulation

“…[19,20] First observation of laser-induced periodic surface structures dates back to the 1960s, when Birnbaum reported ripple formation on the surface of semiconductors. [22][23][24][25][26][27][28][29] Processing conditions occurred to be broad with wavelengths ranging from the mid-infrared to visible spectrum and from continuous wave operation to femtosecond laser systems. [22][23][24][25][26][27][28][29] Processing conditions occurred to be broad with wavelengths ranging from the mid-infrared to visible spectrum and from continuous wave operation to femtosecond laser systems.…”

“…The light is absorbed and the optical excitation ends before the surrounding lattice is perturbed, which results in highly localized nanostructuring without collateral material damage. [22][23][24][25][26][27][28][29] Processing conditions occurred to be broad with wavelengths ranging from the mid-infrared to visible spectrum and from continuous wave operation to femtosecond laser systems. [21] Since then, this phenomenon was observed on virtually any type of media including metal, semiconductor, dielectric solids, and thin films.…”