Abstract

Fabrication of the relief focusing elements are known to include the illumination of light sensitive materials through computer generated /l/ multy-grey-level amplitude mask with corresponding amplitude function of the focusing element /2,3/. In this report the use of dry photopolymer films (see /4/) is discussed. The photopolymer films based on the acrylamide (monomer), polyvinylalcohol (binder), methylene blue (sensitizer) and triethanolamine (initiator) were prepared according to the procedure previously described /4/. The exposure set up used is shown on the fig.1. The photosensitive layer provided sensitivity in the 600-700 nm spectral region, so as a light source 1 the 3 00 Watt halogen lamp with the reflector 2 was used. The filter 3 absorbed the heat radiation to prevent the amplitude mask damaging. The parallel beam at the output was formed by lenses 4. Polymer layer 7 was placed on the glass substrate 8. The direct contact of polymer layer and amplitude mask 6 was provided by glass substrate 5. Polymer layer thickness was 100 μm.

© 1992 Optical Society of America