Optimization Of Aspheric Surface Fabrication Through Sequential Bonnet And Pitch Polishing

Abstract

The fabrication of high-precision aspheric surfaces is vital for advanced optical systems. This study investigates the efficacy of sequential bonnet and pitch polishing techniques in improving the surface quality of aspheric optical components. Initial bonnet polishing achieved a PV value of approximately λ/2, with subsequent measurements showing a PV value of 403 nm, radius of 135.72 mm, and surface roughness (Ra) of 6.9 nm. Pitch polishing further refined these metrics, resulting in a PV value of 256 nm, radius of 135.78 mm, and Ra of 5.4 nm. A final iteration combining both methods reduced the PV value to 210 nm, maintained a radius of 135.77 mm, and achieved an Ra of 3.9 nm. The results indicate significant improvements in surface form values (47%) and roughness (43%) through the sequential polishing process. These findings demonstrate the potential of integrated polishing techniques to enhance the precision and quality of aspheric optical components, meeting the stringent requirements of modern optical applications.