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Active phase compensation system for fiber optic holographyFiber 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 deg without applying any constraints on the placement of the fibers. The accuracy of the phase steps is shown to be better than 0.02 deg., 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.
Document ID
19900024255
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Mercer, Carolyn R.
(NASA Lewis Research Center Cleveland, OH, United States)
Beheim, Glenn
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1989
Subject Category
Optics
Meeting Information
Meeting: Current Developments in Optical Engineering III
Location: San Diego, Ca
Country: United States
Start Date: August 15, 1988
End Date: August 16, 1988
Sponsors: SPIE
Accession Number
90A11310
Distribution Limits
Public
Copyright
Other

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