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Optical Surfaces manufactures high-quality custom prisms to customer-supplied specifications in quantities ranging from prototypes through batch runs to production quantities. These prisms are used in applications including image rotation, inversion, redirection and dispersing light into its constituent colours.

A prism is a transparent optical element with flat, polished surfaces that refract or redirect light. At least two of the flat surfaces must have an angle between them. The exact angles between the surfaces depend on the application.

The company operates in a stable, ISO 9001-2008-approved manufacturing environment and has experience of producing all types and configurations of prism (amici/roof, bi-Fresnal, corner cube retroreflectors, dove, equilateral, isoceles, penta, rhomboid and wedge) with excellent tolerances.

The prisms are manufactured from high-quality optical glasses and are available coated (AR, reflective) or uncoated.

Further information

  • The prisms are available as single components (up to 450mm) or cemented units.
  • Optical Surfaces routinely achieves angle accuracy of better than two arc seconds, surface accuracy of lambda/20p-v, 10/5 surface quality and micro-roughness of less than 1.2nm RMS.
  • Full test data is provided with every prism that leaves Optical Surfaces’ manufacturing facility

Optical Surfaces

Optical Surfaces Ltd has been producing large and demanding high-precision optical components and systems for more than 40 years and is today internationally acknowledged for its technical expertise, attention to quality and customer service.

With the main workshops and test facilities deep underground in an area excavated from solid chalk, temperatures remain constant year-round and vibration is practically non-existent. These are important considerations when making, mounting and testing high-precision optics. Working with these natural advantages Optical Surfaces Ltd is able to supply high-precision off-axis parabolas, spherical and flat mirrors, etalons, aspherics, reference flats, windows, collimators and beam expanders for the most demanding applications. With such stable conditions, testing, particularly with long path lengths, becomes quantifiable and reliable. Investment in large-aperture Fizeau, Zygo GPI, Flashphase, Twyman Green, Scatterplate, and Laser Unequal Path interferometers allows detailed testing of the largest-diameter optics. Topographic and fringe analysis provides precise testing of surface roughness and confirms the wavefront of various surface forms. A rolling programme for calibration of test optics where possible to national standards and production approval to ISO 9001-2008 ensure that the quality of optics from Optical Surfaces is second to none.

Today the company is a trusted supplier to leading scientific, astronomical and defence establishments including many space projects worldwide.

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