Abstract

A passive demodulation technique suitable for interferometric interrogation of short optical cavities is described. It is based on time multiplexing of two low-finesse Fabry–Perot interferometers subject to the same measurand and with a differential optical phase of π/2 (modulo 2π). Independently of the cavity length, two optical outputs in quadrature are generated, which permits signal reading free of fading. The concept is demonstrated for the measurement of vibration using a simple processing scheme.

© 1991 Optical Society of America

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