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Proceedings Paper

Active Phase Compensation System For Fiber Optic Holography
Author(s): Carolyn R. Mercer; Glenn Beheim
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Paper Abstract

Fiber optic delivery systems promise to extend the application of holography to severe environments by simplifying test configurations and permitting the laser to be remotely placed in a more benign location. However, the introduction of optical fiber leads to phase stability problems. Environmental effects cause the pathlengths of the fibers to change randomly, preventing the formation of stationary interference patterns which are required for holography. An active phase control system has been designed and used with an all-fiber optical system to stabilize the phase difference between light emitted from two fibers, and to step the phase difference by 90° without applying any constraints on the placement of the fibers. The accuracy of the phase steps is shown to be better than 0.02°, and a stable phase difference can be maintained for 30 min. This system can be applied to both conventional and electro-optic holography, as well as to any system where the maintenance of an accurate phase difference between two coherent beams is required.

Paper Details

Date Published: 27 January 1989
PDF: 5 pages
Proc. SPIE 0965, Current Developments in Optical Engineering III, (27 January 1989); doi: 10.1117/12.948017
Show Author Affiliations
Carolyn R. Mercer, NASA Lewis Research Center (United States)
Glenn Beheim, NASA Lewis Research Center (United States)

Published in SPIE Proceedings Vol. 0965:
Current Developments in Optical Engineering III
Robert E. Fischer; Warren J. Smith, Editor(s)

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