4 June 2003 New processing techniques for reflection holograms recorded on BB640 holographic emulsions
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In this work we have studied the characteristics of reflection gratings recorded with BB640 emulsions from Colourholographics Ltd. processed with a set of different developers and bleaching techniques. Overall diffraction efficiencies evaluated with spectral response curves result in values higher than 70% (80% taking into account reflection losses) for conventional fixation free rehalogenating bleaching processes, with very low scattering. A slightly lower value was obtained with reversal bleaching techniques, but with lower scattering in the recordings. For the latter, an analytical analysis of the spectral responses based on the Kogelnik's theory has been performed, leading to anomalous results regarding physical thickness of the hologram and the reply wavelength, a performance that points towards holographic profile distortions. We have also used a completely different processing scheme based on Kodak D8, a developer never used in reflection holography, with a direct bleach rendering 40% diffraction efficiency, a broad bandwidth and a reconstruction wavelength longer than the recording one.
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Manuel Ulibarrena, Manuel Ulibarrena, Maria J. Mendez, Maria J. Mendez, Salvador Blaya, Salvador Blaya, Roque F. Madrigal, Roque F. Madrigal, Luis Carretero-Lopez, Luis Carretero-Lopez, Antonio Fimia, Antonio Fimia, } "New processing techniques for reflection holograms recorded on BB640 holographic emulsions", Proc. SPIE 5005, Practical Holography XVII and Holographic Materials IX, (4 June 2003); doi: 10.1117/12.473973; https://doi.org/10.1117/12.473973


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