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Appl Opt. 1991 Mar 1;30(7):729-34. doi: 10.1364/AO.30.000729.

Fiber optic phase stepping system for interferometry.

Abstract

A closed loop phase control system using an all-fiber optical configuration has been developed for use in phase stepping interferometry. This system drives the relative phase of two interfering beams through a sequence of pi/2 rad increments so that the initial relative phase of these beams can be determined. This phase stepping system uses optical fibers to provide spatially uniform phase steps from a flexible, easily aligned optical configuration. In addition, this system uses phase feed back to eliminate phase modulator errors and to compensate for phase drifts caused by environmental disturbances.

PMID:
20582052
[PubMed]
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