With the increase in dimensions of optical elements in addition to ever rising demand for aspherical optics, the millimeter-scale periodic waviness that is naturally produced by machining (such as diamond turning) process in precision optical engineering has been one of the most crucial issues in the development of high surface quality optical elements. Even an extremely small waviness can affect the laser beam profile significantly through interference caused by Bragg scattering. This paper presents a novel method for improving a laser beam profile by utilizing the characteristics of Bragg scattering without requiring established final surface finishing processes such as optical polishing. By engraving an artificial periodic structure with a period of a few hundred microns, the Bragg scattering angle that influences the formation of interference fringes in the laser beam profile was drastically enlarged. Consequently, the quality of the beam profile was improved at a propagation distance where the 0th and 1st (− 1st) order beam modes are spatially separated, only by diamond turning machining without the surface finishing process. In addition, this approach represents an important contribution to green technology, which seeks energy saving and waste reduction in the optical surface manufacturing process.

随着光学元件尺寸的增加以及对非球面光学器件的需求的不断增长，精密光学工程中通过机械加工（例如金刚石车削）过程自然产生的毫米级周期性波纹已成为当今最关键的问题之一。开发高表面质量的光学元件。即使是非常小的波纹度也会因布拉格散射引起的干扰而显着影响激光束轮廓。本文提出了一种新的方法，该方法可通过利用布拉格散射的特性来改善激光束轮廓，而无需建立最终的表面精加工工艺（例如光学抛光）。通过雕刻周期为几百微米的人工周期结构，大大影响了激光束轮廓中干涉条纹形成的布拉格散射角。因此，仅通过未经表面精加工的金刚石车削加工，在第0级和第1级（-1级）光束模式在空间上分开的传播距离处，光束轮廓的质量得到了改善。另外，这种方法代表了对绿色技术的重要贡献，绿色技术在光学表面制造过程中寻求节能和减少浪费。