Fabrication and Characterization of Laser-Polarization-Induced Low-Angular-Dependence Coloration Microstructures on Titanium
摘要
The methods and laws of the influence of laser polarization state on the laser energy distribution, microstructure preparation, and its effect on the color performance of the microstructure were explored. The color microstructures were fabricated on the titanium surface using an infrared fiber laser, with the basic colors of blue, purple, red, orange, and yellow as the research objects. By changing the laser polarization angle θ for lithography preparation, the coloration rules of the fabricated microstructures were revealed. It was found that during the process of increasing θ (0° − 90°), for the red and orange basic colors, the color difference between the fabricated samples and the initial color block samples (θ = 0°) was significant, and a noticeable blue shift phenomenon occurred in the appearance of the color blocks. The surface of the fabricated samples was analyzed by scanning electron microscopy, and it was found that the thickness d of the oxide layer on the surface increased monotonically with the increase of the polarization angle from 0° to 90°. The change in the polarization state of the laser indirectly affects the average energy of the laser reaching the material surface, thereby influencing the microstructural characteristics and color appearance of the material surface.