Product Details Supplier Info More products

Off-axis paraboloids (OAPs) direct and focus incident collimated light at a specific angle, allowing unrestricted access to the focal point as well as reducing the size and minimising the weight of an optical design. Working with high-quality optical glasses, Optical Surfaces produces standard OAPs from 60mm to 600mm in diameter.

Standard and custom design OAPs have been used in applications including Schleiren, FLIR and MTF testing; high-power laser focusing; focusing on astronomical objects; collimating reference wavefronts; beam expansion; and bore sight alignment for missile guidance systems.

Optical Surfaces can routinely produce OAPs with surface accuracy to lambda/20 (peak to valley) depending on off-axis angles. Using proprietary polishing techniques, the company can, depending on the surface accuracy required, achieve the natural limit to the off-axis angle of around 25–30° and surface micro-roughness of less than 1nm.

A range of coatings is available for standard and custom components from metallic with or without protective overcoat to multilayer dielectrics and ultra-hard coatings.

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.

View full profile