Micro milling of fused silica using picosecond laser shaped single crystal diamond tools

Fused silica is widely used as a material for optical lenses owing to its excellent properties and low thermal expansion coefficient. However, hard brittle material, there very limited option of processing technologies machining fused with surface structures. In this paper, picosecond laser based single crystal diamond tool fabrication technology proposed generate micro milling tools different geometrical designs, the cutting performance experimentally tested through micro-milling under conditions. An optimal path inhibit graphitization improve concentricity blades, multi-edge minimum rotary diameter 0.4 mm can be obtained. The effects rake angle on force degree damage subsurface are studied by tests using laser-shaped tools. results show that machined −30° has best finish (Ra = 41.2 nm). Using laser-machined tool, plurality Fresnel aperture 1.6 were successfully sheet.