利用波长为532 nm、脉宽为90 ns的纳秒激光器,精密五轴运动系统,以及自主研发的计算机辅助制造程序,通过精确控制机械运动和激光辐照参数,在平面和自由曲面上制备了周期性亚波长条纹。研究了不同激光能流密度和扫描速率对条纹形成的影响,发现能流密度F=7.52 J/cm 2和扫描速率v=7 mm/s时,形成最佳条纹。结合激光偏振控制器件,发展了一种同步偏振控制技术,实现对激光偏振方向的同步控制,从而实现对条纹方向的精确操控。同时研究了不同的条纹方向对着色效果的影响。在此基础上,在不锈钢平板上制备了颜色鲜艳、外轮廓清晰的彩色图案,进一步实现了曲面上复杂图案的制备。

In this paper, periodic subwavelength ripples were fabricated on the plane and free-form surface by using nanosecond laser with wavelength of 532 nm and pulse width of 90 ns, precise five-axis motion system, and self-developed computer-aided manufacturing (CAM) program. The effects of laser fluence and scanning rate on the formation of ripples were studied. The results show that the best ripples are formed when fluence F is 7.52 J/cm ² and scanning rate v is 7 mm/s. Combined with a laser polarization control device, a synchronous polarization control technology was developed to achieve synchronous control of the laser polarization direction, so as to achieve precise control of ripple direction. At the same time, the effect of ripple direction on the coloring effect was studied. Furthermore, a bright color pattern with clear outer contour can be obtained on a stainless steel plate, which further realizes the preparation of complex patterns on curved surfaces.