Optical Surfaces Ltd is a international supplier of Fabry-Perot etalons in a range of shapes and sizes up to 150 mm in diameter with matching accuracies to lambda /300. Etalons are widely used in telecommunications, lasers and spectroscopic applications to measure the wavelength of light. Recent advances in fabrication technique allow the creation of very precise tunable Fabry-Pérot interferometers.

Optical Surfaces Ltd manufactures Fabry Perot etalons in two basic forms - air-spaced or solid. Both types can be designed for use at customer-defined wavelengths within the range 190nm to about 2 microns.

Fabry Perot etalon pairs from Optical Surfaces Ltd. 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 70 mm. Available as standard in materials including UV grade Silica and Germanium, Optical Surfaces' Fabry-Perot etalons have been supplied to some of the world's leading research institutes and also form an essential OEM component for a growing number of laser and interferometer manufacturers.