We found that pullulan [an <i>a</i> -glucan with (1→4) and (1→6) 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 lines/mm) and producing surface relief. At 1000 lines/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
Dejan Pantelić, Svetlana Savić, and Dragica Jakovljevic, "Dichromated pullulan as a novel photosensitive holographic material," Opt. Lett. 23, 807-809 (1998)