Investigation on the surface texture aspect ratio of freeform surfaced optics and its correlation with the optical performance

Freeform surfaces are known for their versatility in providing complex optical functionalities. The surface texture aspect ratio, representing the relationship between surface height variation and lateral feature size, is examined in relation to vari-focal lenses. Nanometric surface measurement techniques and 3D surface parameters are utilized to quantify the aspect ratio and evaluate its impact on optical performance. Experimental results demonstrate a significant correlation between higher aspect ratios and increased aberrations, leading to decreased optical quality. Controlling the surface texture aspect ratio during manufacturing is crucial for achieving optimal functional performance. This study contributes to the understanding of how the aspect ratio affects the performance of freeform surfaced optic components, providing insights for the design and fabrication of high-performance optical components. Future research can explore optimization strategies and advanced manufacturing techniques to enhance functional performance in optics and optical system design.