Optical Surfaces Ltd (Surrey, UK) can supply Fabry-Perot etalons in a range of shapes and sizes up to 150mm in diameter with matching accuracies to lambda/300. Etalons are widely used in telecommunications, lasers and spectroscopic applications to measure the wavelength of light. Fabry Perot etalons are available from Optical Surfaces Ltd in two basic forms - air- spaced or solid. Designed for use at customer-defined wavelengths within the range 190nm to about 2 microns, they are supplied with wedge angles of 5 min of arc for smaller diameters, rising in steps to a wedge angle of 40 min of arc for diameters greater than 70mm.
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