Request InfoOptical Surfaces Ltd.Off-axis paraboloids from Optical Surfaces Ltd. have diameters up to 600 mm, a surface accuracy of up to λ/20 and off-axis angles up to 25°. A range of coatings is available for standard and custom components from metallic with or without protective overcoat to multilayer dielectrics and ultrahard coatings for high-power lasers. The off-axis paraboloids are suitable for use in broadband or multiple-wavelength applications such as telescopes, beam expanders, forward-looking infrared test systems, collimators, spectrometers and laser beam focusing.See full productRelated content from Photonics MediaPRODUCTSPromoted Content October 2023 IssueOrder Sorting FiltersWhen the spectrum of a spectrometer covers more than one octave, the multiple orders from the grating make interpretation of the detected spectrum difficult. 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