High-Accuracy Glass Molding Press for Ultrathin Fresnel Lenses

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Recently, the needs for glass Fresnel lenses is increasing for the purpose of miniaturization of optical systems. In this study, molds for high-temperature glass molding were developed and molding experiments for ultra-thin Fresnel lenses were performed. The glass flowing mechanism, stress/strain distribution, and the atomic diffusion phenomena at the interface among the glass, the release agent coating and the mold were investigated by experiments and numerical simulation. Process optimization was performed for improving the service life of the molds.