Journal
OPTICS LETTERS
Volume 34, Issue 7, Pages 1033-1035Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.34.001033
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- U.S. Department of Defense Joint Technology Office through their High-Energy Laser Multidisciplinary Research Initiative (HEL-MRI
- U.S. Air Force Office of Scientific Research (AFOSR) [FA9550-07-1-0566]
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The field of transparent ceramics is enjoying a renaissance, as refractory oxides are being developed as alternatives to single crystals in high-performance laser systems. However, a significant challenge remains regarding the reduction of the grain size to sufficiently subwavelength dimensions in order to achieve the same degree of optical transparency as the single-crystal analog. Here we report transparent yttria (Y2O3) ceramics that were synthesized by a pressure-assisted, two-step, low-temperature sintering process with an average grain size of 300 nm. These nanograined ceramics exhibit equivalent transmission to single crystalline yttria for wavelengths greater than about 1200 nm. The single-crystal-like transmittance of the nanograined yttria ceramics in the visible and IR region is an important advancement for the use of these materials in more-extreme environments, including high-energy laser systems where reduction of scattering is paramount. (C) 2009 Optical Society of America
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