Abstract
The study proposes a manufacturing method of aspherical Fresnel lens and dies with ideal lens profile. Conventional methods such as photolithography reveals low surface quality due to step-like cross-section and burr generation. In the study, the use of side cutting edge of a single crystal diamond tool allow Fresnel lens and dies to be manufactured with high optical efficiency. Ultraprecision Fresnel lens dies of 60 mm in diameter was created without any burr by using an ultraprecision turning center having 1 nm positioning accuracy and a diamond tool. The surface roughness of slopes in Fresnel lens grooves was 8 nm (peak to valley) in the radial and circumferential directions. Fresnel lens manufactured directly on an acrylic resin plate also shows disigned performance.
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