Air-wedge shearing interferometer

The air-wedge shearing interferometer is probably the simplest type of interferometer designed to visualize the disturbance of the wavefront after propagation through a test object. This interferometer is based on utilizing a thin wedged air-gap between two optical glass surfaces and can be used with virtually any light source, even with non-coher...
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Air-Wedge Shearing Interferometer

[lateral and radial shearing] ...
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