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Proceedings Paper

Determination of average refractive index of spin-coated DCG films for HOE fabrication
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Paper Abstract

The refractive index of holographic emulsions is an important parameter needed for designing holographic optical elements (HOEs). In this paper theoretical calculations of the accuracy required for the refractive index and thickness of emulsions needed to meet predetermined Bragg angle conditions are presented. A modified interferometric method is used to find average refractive index of the unexposed and the developed dichromated gelatin holographic films. Slanted transmission HOEs are designed considering the index and thickness variations, and used to verify the index measurement results. The Brewster angle method is used to measure surface index of the unexposed and the developed films. The differences between average index and surface index are discussed. Theoretical calculation of the effects of index variation on diffraction efficiency, and experimental results for index modulation variation caused by process changes are also presented.

Paper Details

Date Published: 17 September 1993
PDF: 10 pages
Proc. SPIE 1914, Practical Holography VII: Imaging and Materials, (17 September 1993); doi: 10.1117/12.155010
Show Author Affiliations
Tae-Jin Kim, Univ. of Arizona (United States)
Eugene Warren Campbell, Univ. of Arizona (United States)
Raymond K. Kostuk, Univ. of Arizona (United States)

Published in SPIE Proceedings Vol. 1914:
Practical Holography VII: Imaging and Materials
Stephen A. Benton, Editor(s)

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