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Optical Surfaces offers a range of plano-convex and plano-concave toroidal mirrors for spectroscopic and imaging applications.

The company produces custom toroidal mirrors in a range of materials (Zerodur, BK7, Fused Silica) with typical surface accuracy of better than lambda/5 and surface quality of 20:10 scratch dig.

Optical Surfaces can produce both Plano-convex and Plano-concave toroidal mirrors in a range of shapes — largest dimension up to 400mm — with durable optical coatings.

Key specifications

  • Offers advantages where a beam must be focused and folded
  • Rather than using both a spherical mirror and a plane mirror, both functions may be combined in one element
  • The lower number of optical elements increases energy throughput, saves money and also allows for more compact designs
  • Toroidal mirrors also correct for the astigmatism that result when a spherical mirror is used off axis

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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