| The change in resonance frequency of the etalon measures the change in optical-path length. |
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| It consists of two highly reflective and strictly parallel plates called an etalon. |
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| Because of the high reflectivity of the plates of the etalon, the successive multiple reflections of light waves diminish very slowly in intensity and form very narrow, sharp fringes. |
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| This paper describes the development of an interferometric pressure transducer using a single etalon fringe as an intensity mode signal for a deflectable silicon diagram. |
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| The laser output will be composed of longitudinal modes that fall inside the transmission band of the etalon, hence a narrowing of the laser line width is observed. |
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