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4 June 2001 Transmission and reflection SHSG holograms
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Proceedings Volume 4296, Practical Holography XV and Holographic Materials VII; (2001)
Event: Photonics West 2001 - Electronic Imaging, 2001, San Jose, CA, United States
Silver halide sensitized gelatin (SHSG) holograms are similar to holograms recorded in dichromated gelatin (DCG), the main recording material for holographic optical elements (HOEs). The drawback of DCG is its low energetic sensitivity and limited spectral response. Silver halide materials can be processed in such a way that the final hologram will have properties like a DCG hologram. Recently this technique has become more interesting since the introduction of new ultra- fine grain silver halide (AgHal) emulsions. In particular, high spatial frequency fringes associated with HOEs of the reflection type are difficult to convert employing SHSG processing methods. Therefore, an optimized processing techniques for reflection HOEs recorded in the new AgHal- materials is introduced. Diffraction efficiencies over 90 percent can be obtained for both transmission and reflection diffraction gratings. Understanding the importance of the selective hardening process has made it possible to obtain results similar to conventional DCG processing. The main advantage of the SHSG process is that high-sensitivity recording can be performed with laser wavelengths anywhere within the visible spectrum. This simplifies the manufacturing of high-quality, large-format HOEs, including also high-quality display holograms of the reflection type, both monochrome and full color.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jong Man Kim, Byung So Choi, Yoon Sun Choi, Sun Il Kim, Jong-Min Kim, Hans I. Bjelkhagen, and Nicholas J. Phillips "Transmission and reflection SHSG holograms", Proc. SPIE 4296, Practical Holography XV and Holographic Materials VII, (4 June 2001);

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