The effect of crystal structure on fabrication of fine periodic surface structures with short pulsed laser

In recent years, nanostructures have been demanded for industry and medical services to produce functions such as reduction of friction, control of wettability and enhancement of biological affinity. Ultrashort pulsed lasers have been applied to meet these demands and have been actively studied both experimentally and theoretically about phenomena and principles. In this study, to clarify the phenomenon of fabrication of nanostructures and to apply to industry, experiments were conducted on SUS304 by a short pulsed laser that has longer pulse duration, more cost-effective and higher stability than ultrashort pulsed lasers. The results confirmed that a uniform fine periodic structure was not fabricated on the whole irradiated surface and crystal grain boundaries appeared since SUS304 is an alloy composed of Fe, Cr and Ni, and the short pulsed laser has low power and long pulse duration inducing the thermal effect compared to ultrashort pulsed laser. Our research group clarified the effect of crystal structure on fabricating fine periodic surface structures with short pulsed laser.