Exclusive display of patterns fabricated by femtosecond laser

In this paper, we demonstrate the exclusive display of the patterns fabricated by femtosecond laser with a central wavelength of 800 nm on the 316L stainless steel surface. The uniform ripple structures with a period of 540 nm can be produced under the laser scanning speed of 15 mm/s, line space of 20 m and laser energy density of 1.1 J/cm2. The strong dependence of the ripple orientation on the polarization of laser light offers us the opportunity of fabricating different patterns with different types of ripples. By rotating the sample, the patterns can be exclusively observed under the irradiation of the white light from different angles. In addition, the coordinate areas and the spectral ranges for the exclusive display of the patterns are studied. Finally, the potential applications of this technology are illustrated.