Improving the repeatability of the spectral bandwidth and diffraction efficiency of holograms formed in dichromated gelatin
AffiliationUniv Arizona, Coll Opt Sci
Univ Arizona, Dept Elect & Comp Engn
MetadataShow full item record
PublisherSPIE-INT SOC OPTICAL ENGINEERING
CitationChrysler, B. D., Salay, E. J., & Kostuk, R. K. (2020, April). Improving the repeatability of the spectral bandwidth and diffraction efficiency of holograms formed in dichromated gelatin. In Photosensitive Materials and their Applications (Vol. 11367, p. 1136718). International Society for Optics and Photonics.
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AbstractDichromated gelatin is a photosensitive film that has been used for making holographic films for more than 50 years. The film has excellent optical qualities such as high transparency, high index modulation capacity, and a wide range of film thicknesses. The film also has the unique property of broadened spectral and angular bandwidth using a non-linear film swelling effect and can be prepared using inexpensive materials and processes. Unfortunately, the film is also known for being difficult to work with and to obtain repeatable results. Although there are many examples of research groups and companies that attained repeatable processes, there is a surprising lack of data and analysis in literature describing the factors that influence the repeatability and uniformity of the material and potential solutions for improving the process. In this study, the environmental humidity during the film drying process is controlled between 25% and 75% and the resulting holograms are analyzed to determine the effect on repeatability. A strong correlation between the drying humidity and the variation in the spectral diffraction efficiency of the holograms is determined. An optimal drying humidity of 65% is found to reduce the variability in the Bragg-matched wavelength for normally incident light from +/-100nm when dried at 25% humidity to +/-15nm when dried at 65% humidity.
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