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Precision Etalon Plates for Fabry Perot Interferometers

Optical Surfaces Ltd is a leading supplier of ultra high precision Etalon plates for use in Fabry-Perot interferometers.

Etalons are available in two basic forms, air-spaced or solid. Designed for use at customer-defined wavelengths within the range 190nm to about 2 microns, Optical Surfaces etalons are supplied with wedge angles of 5 minutes of arc for smaller diameters, rising in steps to a wedge angle of 40 minutes of arc for diameters greater than 70mm. They are available as standard in materials including UV grade Silica and Germanium.

Drawing upon our unique stabilised manufacturing environment and team of skilled optical craftsmen we regularly supply etalons in a range of shapes and sizes with matching accuracies to lambda / 300". He added " Optical Surfaces has built up a worldwide reputation for producing these super-flat components, supplying many customers in scientific institutes, observatories and industry. For example the set of 165mm diameter Fabry-Perot Etalons that we supplied to the Massachusetts Institute of Technology (MIT), are a key component lying at the heart of the Millstone Hill Atmospheric science facility operated in cooperation with the University of Pittsburgh (USA). The purpose of this instrument is to measure Doppler shifts in the atmosphere.

Dr Aris Kouris of Optical Surfaces

For further information please contact Optical Surfaces Ltd on +44-208-668-6126 / [email protected].

Optical Surfaces Ltd ( has been producing optical components and systems for more than 50 years and is now accepted as one of the world's leading manufacturers of high precision optics and optical systems for a wide range of applications. The company's ISO 9001-2008 approved manufacturing workshops and test facilities are deep underground in a series of tunnels excavated in solid chalk where temperature remains constant and vibration is practically non-existent. With such stable conditions testing, particularly with long path lengths, becomes quantifiable and reliable. Working with these natural advantages is a highly skilled team of craftsmen with a commitment to excellence in both product quality and customer service.


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