The advantage of this configuration is greater flexibility, because both interferometer arms can be modified independently of each other. Compensation of intrinsic aberrations in the interferometer. A twymangreen interferometer is a modified michelson interferometer. Breckinridge a dichromated gelatin offaxis fresnel zone plate ofzp was designed, fabricated, and used in a new type. A twymangreen interferometer is a variant of the michelson interferometer principally used to. Surface figure twymangreen null optics typically required, e. Its applicability has grown ever since, and although the laserbased fizeau is probably the most commonly used testing interferometer, the twymangreen is useful for introducing. The invention of the laser increased the utility of the twymangreen. An explanation of the twymangreen interferometer from field guide to interferometric optical testing, spie press.
Phasecam dynamic twymangreen laser interferometers provide high resolution measurements despite vibration and air turbulence. The twymangreen interferometer was invented and patented in 1916 and was originally intended for testing prisms and microscope objectives. Rp photonics encyclopedia twymangreen interferometers. Testing curved surfaces and lenses university of arizona. What links here related changes upload file special pages permanent link page. Twymangreen setup the most flexible interferometer setup. Lens l1 is a wellcorrected lens in order for plane wave fronts to enter the interferometer, and is fixed to the interferometer bench. Splitter coherence requirements uses of a twymangreen interferometer. Twymangreen interferometers can be used to monitor the optical quality of optical components such as lenses. Compact and lightweight, phasecams make reconfiguring test.
A twymangreen interferometer twymangreen laser interferometer can measure shape and wavefront quality of optics and optical surfaces. Twymangreen interferometer optical shop testing wiley online. Design and construction of an interferometer system for the study of. Optical metrology for large space and terrestrial telescope optics a white paper 4d technology a nanometrics business unit. Here the beam splitter is separated from the reference surface.
Twymangreen interferometer optical shop testing wiley. Dynamic interferometry enables phasecam laser interferometers to capture full wavefront measurements in as little as 30 microseconds5000 times faster than conventional phase shifting interferometers. Phase fizeautwymangreen interferometer from trioptics. With m1 and m2 blocked off, and beamsplitter removed, auto.