EXPERIMENTAL-STUDY ON AND TRIETHANOLAMINE THE COMBINATIVE ACTION OF ZINC-CHLORIDE ON IMPROVING PHOTOSENSITIVITY IN RED-SENSITIZED DICHROMATED GELATIN

An experimental study to ascertain the combinative action of zinc chlo ride and triethanolamine (TEA) on improving the photosensitivity of re d-sensitized dichromated gelatin (RSDCG) has been carried out. Firstly , the exposure properties of homemade RSDCG holographic plates were st udied experimentally. Then, zinc chloride was added into the red-sensi tized dichromated gelatin to observe its catalytic effect on photo-cro ss-linking of gelatin molecules in RSDCG. After that, triethanolamine, as an external electron donor in the red-sensitized dichromated gelat in photo-chemical reaction, was introduced into the red-sensitized dic hromated gelatin to make its photosensitivity higher in this study. Fi nally, the combinative effect of zinc chloride and triethanolamine on the photosensitivity in RSDCG holograms was studied. The results show that (I) zinc chloride and triethanolamine have an obvious combinative effect on improving the photosensitivity of the red-sensitized dichro mated gelatin, (2) the curve of diffraction efficiency of holographic transmission grating recorded in the red-sensitized dichromated gelati n versus exposure energy is bell-shaped and the maximum diffraction ef ficiency 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 hol ograms can reach a Value of 0.0153. (C) 1998 Elsevier Science Ltd. All rights reserved.