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Optical Glass Technology

Any critical review of the technology associated with geometrical optics must certainly include a discussion of optical glass. Optical glass is a material which is familiar to all optical designers; however, few designers are familiar with the manufacturing process. This article considers optical glass from a manufacturer's point of view, with the goal of pre-senting a perspective which may help the designer to better understand why all his desired properties cannot be fulfilled and what compromises must be made. Also discussed is the meaning of terms used to quantify the inhomogeneities found in optical glass.