Abstract

An accurate method for observing the change over a wide range in the optical path length of a fiber-optic Fabry-Perot interferometer is presented. The temporal movement of the interference fringes is converted to a circular motion on an oscilloscope display and is recorded with the use of a microcomputer. The variation of the optical length can be measured with an accuracy of ∼λ/400 wavelength.

© 1986 Optical Society of America

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