Request InfoTower Optical Corp.Tower Optical Corp. is offering optical flats made from BK7 or fused silica. They are used as a reference against which the flatness of an unknown surface can be determined and also as windows. The fused silica types are available in single- and double-sided versions and maintain a flatness of λ/10 or λ/20. Their diameters range from 25 to 200 mm with λ/10 flatness. The BK7 types offer flatness of λ/4 or better.See full productRelated content from Photonics MediaPRODUCTSPromoted Content March 2024 IssuePrecision Polished SubstratesOhara is a world-class manufacturer of high-quality double-side lapped and polished substrates suitable for use at 248 nm. Exhibiting unmatched cleanliness, precision, and surface roughness and...Promoted Content November 2022 IssueSpecialty Fiber Fused Silica PreformsOptical fibers are among the hidden champions of our time. 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