Diffractive Optical Elements In Photosensitive Inorganic Glasses
High-efficiency Bragg gratings were created in sodium-zinc-aluminum-silicate glass doped with cerium, silver, and fluorine. Recording is a two-step process. The first step is a glass exposure to UV radiation. The second is a thermal development for crystalline phase precipitation in the exposed areas. The relative and absolute diffraction efficiency has been measured at different wavelengths for different doses of irradiation and conditions of thermal development. Retractive index changes in the volume of PTR glass have been measured by using interferometry techniques and by volume Bragg grating characterization. Absolute diffraction efficiency above 96 % was observed. Spatial frequencies from a few hundred to ten thousand lines per millimeter were achieved. Gratings working both in transmitting and reflecting modes are demonstrated. High photosensitivity allows recording at exposures below 1 J/cm2. PTR Bragg gradings are stable up to 400°C. Novel volume holographic elements have been made from Bragg diffractive gratings in PTR glass including transmitting and reflecting volume diffractive elements. The use of such diffractive elements for lasers and telecommunication are discussed.
Proceedings of SPIE - The International Society for Optical Engineering
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Efimov, O. M.; Glebov, L. B.; and Smirnov, V. I., "Diffractive Optical Elements In Photosensitive Inorganic Glasses" (2001). Scopus Export 2000s. 432.