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.
This week's Question: Fox Sports offered virtual-reality streams from last week's U.S. Open, a major golf championship in Oakmont, PA. Sports fans who owned the right devices could watch the golf event on the television while using VR for...
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