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Pure Silica Diffraction Gratings and Mocrolens Arrays Made by the Sol-Gel Process

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Abstract

Surface feature optics, including binary optics, sinusoidal gratings, and high-fill factor microlens arrays, are being intensively developed for use in beam splitting and optical computing. Most are fabricated in plastics, and are therefore subject to such general disadvantages as limited optical transmission and high CTE. Some can be scribed in silica but dimensions are limited and fabrication costs are extremely high. Using the sol-gel process, it is possible to fabricate surface feature optics in pure silica by a room-temperature molding technique. This technique provides the advantage of the highly favorable optical qualities of silica, such as broadband transmission, low CTE and exceptional resistance to laser damage.

© 1992 Optical Society of America

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