Laser polishing is widely employed to reduce the surface roughness of products with complex geometries. Traditional laser polishing techniques use a single high-power Gaussian beam to melt and smooth a thin layer of surface material. However, the reliance on high power lasers can present practical challenges such as minimizing surface evaporation or reducing overall cost. In this work, we combined two identical low-power laser beams with a spatial offset in between them to construct an elliptical beam. By changing the spatial offset, combined beams with different lengths along the major axis can be created. We observe over 20% improvement in line roughness reduction using this approach compared to a single Gaussian laser beam with the same total power. Additionally, both experiment and simulation results suggest such improvement is because this dual-laser set-up can create a longer molten pool compared to a single laser.

激光抛光被广泛用于降低具有复杂几何形状的产品的表面粗糙度。传统的激光抛光技术使用单个高功率高斯光束来熔化和平滑表面材料的薄层。然而，对高功率激光器的依赖可能会带来实际挑战，例如最大限度地减少表面蒸发或降低总体成本。在这项工作中，我们将两个相同的低功率激光束与它们之间的空间偏移相结合，以构建一个椭圆光束。通过改变空间偏移，可以创建沿主轴具有不同长度的组合光束。与具有相同总功率的单个高斯激光束相比，我们观察到使用这种方法可以减少超过 20% 的线粗糙度。此外，