Effects of Electrolyte on Laser-Induced Periodic Surface Structures with Picosecond Laser Pulses

Abstract

Short-pulsed laser-induced periodic surface structures (SPLIPSSs) have the possibility to control tribology, wettability and biocompatibility. Nevertheless, the optimal structure depends on each functionality, which has not been clarified. The hybrid process with a short-pulsed laser and electrochemical machining (SPLECM) is, then, proposed to fabricate micro/nano hybrid structures and to modify the surface composition for providing high functionalities with material surfaces. Electrochemical machining is a well-established micro-elution and deposition method with noncontact between a workpiece and a tool. In this study, the effects of electrolytes on SPLIPSSs were investigated experimentally by the picosecond laser irradiation on 304 stainless steel substrates in various electrolytes. The geometry of SPLIPSSs depended on the types and the concentration of electrolytes. In the case of copper nitrate solution and copper sulfate solution, LIPSSs and spheroidization of copper were obtained. This study demonstrated the possibility of SPLECM to fabricate micro/nano structures and to control surface composition.

High orientation consistency and adjustable convex width of laser-induced periodic surface structures using picosecond laser pulse trains

“…Much work has been conducted on the effect of the laser parameters on the period of LSFLs. It was concluded that laser wavelength [17,18] had the main responsibility for the period of LSFLs and laser power [19,20], angle of incidence [21], and scan speed [20,22], slightly modifying the period of LSFLs. As a result, the period of LSFLs can be easily modified by regulating the laser wavelength.…”