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Proceedings Paper

Impact Of Polarization-Sensitive Materials On Coherent Optical System Performance
Author(s): Kenneth G. Leib; Benjamin J. Pernick; Nils J. Fonneland
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Paper Abstract

Many recording films have polarization properties that can influence and degrade the performance of a coherent optical system. Contrast reduction, amplitude distortion, and wavefront modulation are possible adverse consequences when using these films for data recording, storage, or playback. The polarization characteristics, or a lack thereof, of several film types, three optical adhesives, and five index-of-refraction matching liquids were measured. Unexposed strips of film were developed in D-19 and/or D-76 developer. The developed film strips were immersed in a nonpolarizing index-matching liquid and placed between an incident, linearly polarized laser beam and a crossed analyzer. The film strip was rotated through a full 360 deg., while the light transmitted through the crossed analyzer was measured and the experimental results recorded. These polarization measurements reflect the integrated effect over a circular region of 20-mm diameter. By separating the emulsion from the film backing, the major contribution of the backing to the polarization response was determined. We have modeled the response of a film strip as either an ideal linear polarizer or a birefringent material. A comparison of calculated angular scan with experimental results enables one to characterize the nature of the polarization properties of a selection of samples. A second factor to be considered concerns the "fog" level density of the unexposed film. A high density level or a corresponding low transmission level decreases the power efficiency of the optical system and modifies the contrast ratio. We have found that the fog density varies over a wide range of values for the set of films tested. The transmission data for the developed (i.e., unexposed) films also are reported.

Paper Details

Date Published: 25 January 1990
PDF: 10 pages
Proc. SPIE 1166, Polarization Considerations for Optical Systems II, (25 January 1990); doi: 10.1117/12.962912
Show Author Affiliations
Kenneth G. Leib, Corporate Research Center (United States)
Benjamin J. Pernick, Corporate Research Center (United States)
Nils J. Fonneland, Corporate Research Center (United States)

Published in SPIE Proceedings Vol. 1166:
Polarization Considerations for Optical Systems II
Russell A. Chipman, Editor(s)

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