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Other examples of wavefront splitting interferometer include the Fresnel biprism, the Billet Bi-Lens, diffraction-grating Michelson interferometer, [14] and the Rayleigh interferometer. [15] Figure 5. Two wavefront splitting interferometers. In 1803, Young's interference experiment played a major role in the general acceptance of the wave ...
A Mirau interferometer works on the same basic principle as a Michelson interferometer. The difference between the two is in the physical location of the reference arm. [1] The reference arm of a Mirau interferometer is located within a microscope objective assembly. It is named after André Henri Mirau, who filed a patent on the concept in ...
The use of a figured reference mirror in one arm allows the Twyman–Green interferometer to be used for testing various forms of optical component, such as lenses or telescope mirrors. [11] Fig. 6 illustrates a Twyman–Green interferometer set up to test a lens.
Bath interferometer (common path) Cyclic interferometer; Diffraction-grating interferometer (white light) Double-slit interferometer; Dual-polarization interferometry; Fabry–Pérot interferometer; Fizeau interferometer; Fourier-transform interferometer; Fresnel interferometer (e.g. Fresnel biprism, Fresnel mirror or Lloyd's mirror)
The flats in an interferometer are often made in a wedge shape to prevent the rear surfaces from producing interference fringes; the rear surfaces often also have an anti-reflective coating. In a typical system, illumination is provided by a diffuse source set at the focal plane of a collimating lens. A focusing lens after the pair of flats ...
Fizeau interferometers are commonly used for measuring the shape of an optical surface: Typically, a fabricated lens or mirror is compared to a reference piece having the desired shape. In Fig. 1, the Fizeau interferometer is shown as it might be set up to test an optical flat. A precisely figured reference flat is placed on top of the flat ...
Rayleigh interferometer at the National Bureau of Standards In optics , a Rayleigh interferometer is a type of interferometer which employs two beams of light from a single source. The two beams are recombined after traversing two optical paths , and the interference pattern after recombination allows the determination of the difference in path ...
As in a Fabry–Pérot interferometer, the light that leaks out has phase that depends on how many times it has bounced inside the plate. A lens is used to overlap light that has emerged after varying numbers of bounces, producing an interference pattern. A key difference from a Fabry–Pérot etalon is that input light that reflects from the ...