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

Tae-Jin Kim; Eugene Warren Campbell; Raymond K. Kostuk

doi:10.1117/12.155010

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17 September 1993 Determination of average refractive index of spin-coated DCG films for HOE fabrication

Tae-Jin Kim, Eugene Warren Campbell, Raymond K. Kostuk

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Proceedings Volume 1914, Practical Holography VII: Imaging and Materials; (1993) https://doi.org/10.1117/12.155010
Event: IS&T/SPIE's Symposium on Electronic Imaging: Science and Technology, 1993, San Jose, CA, United States

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.

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Tae-Jin Kim, Eugene Warren Campbell, and Raymond K. Kostuk "Determination of average refractive index of spin-coated DCG films for HOE fabrication", Proc. SPIE 1914, Practical Holography VII: Imaging and Materials, (17 September 1993); https://doi.org/10.1117/12.155010

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