Twyman-Green interferometer
- Twyman-Green interferometer
A Twyman-Green interferometer is a variant of the Michelson interferometer principally used to test optical components. The setup of the Twyman-Green interferometer is similar to that of the Michelson interferometer (cf. same for a picture of the setup). There are two differences between the Michelson and Twyman-Green interferometers. First, the fixed mirror in the Michelson interferometer is rotatable in the Twyman-Green interferometer, and second, while the light source is usually an extended source (although it can also be a laser) in a Michelson interferometer, the light source is always a point-like source in the Twyman-Green interferometer.
The rotation of one mirror results in straight fringes appearing in the interference pattern, a fringing which is used to test the quality of optical components by observing changes in the fringe pattern when the component is placed in one arm of the interferometer.
External links
* [http://electron9.phys.utk.edu/optics421/modules/m5/Interferometers.htm University of Tennessee Modern Optics course ]
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