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2 November 2001 Diffractive optical elements in photosensitive inorganic glasses
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Abstract
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. Refractive 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 percent 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 gratings are stable up to 400 degrees 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 laser and telecommunication are discussed.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Oleg M. Efimov, Leonid B. Glebov, and Vadim I. Smirnov "Diffractive optical elements in photosensitive inorganic glasses", Proc. SPIE 4452, Inorganic Optical Materials III, (2 November 2001); https://doi.org/10.1117/12.446892
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