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Shearing Interferometers can be used to determine if a coherent beam of light is collimated. The design consists of a wedged optical flat mounted at 45° and a diffuser plate with a ruled reference line down the middle. These interferometers are designed to provide qualitative analysis of a beam's collimation.
shearing interferometer is an extremely simple means to observe interference and to use this phenomenon to test the collimation of light beams, especially from laser sources which have a coherence length which is usually a lot longer than the thickness of the shear plate (see graphics) so that the basic condition for interference is fulfilled.
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BK7 glass substrates, 50 mm dia, 1 mm thick
High reflectivity mirror with hard dielectric coating (45° angle of incidence 532nm)
Plano convex lens, dia 25.4 mm, focal length 9.2 cm
β Barium borate crystals (15 x 15 x 5 mm3)
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