Request InfoOptical Surfaces Ltd.Reference flats composed of high-stability materials such as glass, Zerodur and silica are available from Optical Surfaces Ltd. Suitable for astronomy, laser beam steering and op-tical flatness testing, the optics have a surface accuracy of λ/30 pv and roughness of 10 Å rms on flats with diameters up to 600 mm. Optics with diameters up to 450 mm are provided with Fizeau interferometric test reports, and larger flats are quality-assured using the Ritchey-Common test procedure. Large specialist requirements and OEM quantities are offered.See full productRelated content from Photonics MediaPRODUCTSPhotonics Spectra October 2022 IssueCompact Beam ExpandersThe A1 series of compact beam expanders from Optical Surfaces Ltd. delivers ×30 magnification from 2-mm aperture high-power laser beam lines. 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