Request InfoEsco OpticsEsco Optics Inc. has announced the addition of precision-quality, first-surface mirrors to its online catalog of stock optics. Manufactured from fused silica, the substrates benefit from the material’s low coefficient of thermal expansion, providing a stable 0.10 wave surface figure and 40-20 scratch/dig over an 85 percent clear aperture. The second surface is ground and all edges are beveled. 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