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Alluxa - Optical Coatings LB 8/23
Photonics Dictionary

laser strainmeter

An instrument usually consisting of a very long interferometer, 3 to 800 m, and a laser light source for the study and measurement of strain, such as those formed by earth tides and gravitational waves. The variation in the length of the strainmeter, usually defined as the variation in one element of the local strain, is measured in terms of an optical wavelength.
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