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High-efficiency even- numbered spot array generators

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Abstract

Phase gratings are important components of prototype free-space digital optical processing systems. They generate spot arrays to illuminate optical processing devices and there by facilitate the transfer of information between modules. Three criteria for judging spot array generation systems are (i) the match of the spot array formate to that of the optical logic array (e.g., odd vs even numbered formats), (ii) the relative spot intensity uniformity, and (iii) the efficiency of coupling light into the desired spots. Earlier work has demonstrated improvements in the first two issues.1 The issue of efficiency requires examination in anticipation of high speed or very large multichannel systems. The efficiencies of simple binary phase gratings ranges from ~70-85% for 1-D arrays. By extending designs to multiple phase levels the efficiency is significantly increased. These multilevel gratings are fabricated by repeating steps in the fabrication process.

© 1991 Optical Society of America

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