Abstract
An experimental study to ascertain the combinative action of zinc chloride and triethanolamine (TEA) on improving the photosensitivity of red-sensitized dichromated gelatin (RSDCG) has been carried out. Firstly, the exposure properties of home-made RSDCG holographic plates were studied experimentally. Then, zinc chloride was added into the red-sensitized dichromated gelatin to observe its catalytic effect on photo-cross-linking of gelatin molecules in RSDCG. After that, triethanolamine, as an external electron donor in the red-sensitized dichromated gelatin photo-chemical reaction, was introduced into the red-sensitized dichromated gelatin to make its photosensitivity higher in this study. Finally, the combinative effect of zinc chloride and triethanolamine on the photosensitivity in RSDCG holograms was studied. The results show that (1) zinc chloride and triethanolamine have an obvious combinative effect on improving the photosensitivity of the red-sensitized dichromated gelatin, (2) the curve of diffraction efficiency of holographic transmission grating recorded in the red-sensitized dichromated gelatin versus exposure energy is bell-shaped and the maximum diffraction efficiency of the grating can reach as high as 83% at an exposure energy of about 200 mJ/cm 2, (3) the refractive index modulation of the holograms can reach a value of 0.0153.
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