Abstract

We found that pullulan [an $\alpha$-glucan with $\left(1\to 4\right)$ and $\left(1\to 6\right)$ linkages] doped with chromium ions posseses promising holographic properties. It is environmentally stable and is capable of registering high spatial frequencies (as many as $1500 \mathrm{lines}/\mathrm{mm}$) and producing surface relief. At $1000 \mathrm{lines}/\mathrm{mm}$ pullulan's diffraction efficiency was 4%. Chemical treatment of pullulan with a mixture of water and isopropyl alcohol is simple. However, as expected from analogy with dichromated gelatin, pullulan is sensitive in only the blue-green region of the spectrum.

© 1998 Optical Society of America

Real-time and postprocessing holographic effects in dichromated pullulan

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