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CO2 laser diffractive optics fabrication on photopolymer and performance evaluation

A new technological approach using dry photopolymer recording material makes it possible to fabricate the relief focusing elements for IR radiation. The formation of the relief structure by self-development takes place in the dark, subsequent to the illumination through the computer generated amplitude mask. No wet processing is required. These diffractive elements exhibit low surface scattering. Dye sensitized polymerization of acrylamide has been found to produce nonlinearity of the relief recording. A diffraction efficiency of about 55% has been achieved for CO2 laser radiation.