Effective Regulation of Dazzling Effect on the Surface of Alloy Induced by Femtosecond Laser

With the rapid development of high-pulse femtosecond laser technology, femtosecond laser processing has gradually become industrialized. One femtosecond is one-billionth of a second, in view of its extremely short duration of action, and allow lasers to achieve extremely high-power peaks at low pulse energies. Compared with the classic long pulse laser, femtosecond laser cold processing can effectively avoid the negative effects caused by energy transfer and thermal diffusion with great advantages such as non-hot melt processing and micro-nano processing. A femtosecond laser induced periodic surface structure (FLIPSS) can be formed on the metal surface by femtosecond laser scanning. This structure of micro-nano grating is similar to that of the reflective grating, which reflects lights of different wavelength through diffraction to form a dazzling effect. In this paper, different patterns of alloy samples were processed by femtosecond laser processing and the dazzling effect was observed from various angles. We also used scanning electron microscopy to observe the surface micro-nano periodic structure of silver alloy, and the effects of different stripe spacing and direction on the metallic dazzling were analyzed.