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Opt Lett. 2011 Mar 1;36(5):740-2. doi: 10.1364/OL.36.000740.

Fabrication and characterization of a water-free mid-infrared fluorotellurite glass.

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  • 1Center for Optical Technologies and Physics Department, Lehigh University, Bethlehem, Pennsylvania 18015, USA.


Using a physical and chemical dehydration technique and a high-pressure, ultradry O2 atmosphere in a semiclosed steel-chamber furnace, we fabricated a group of fluorotellurite glasses with a composition of (90-x)TeO2-xZnF2-10Na2O (mol.%, x=0-30). For x=30, no OH absorption was observed in the range of 0.38-6.1 μm. This is the first report of a water-free mid-IR fluorotellurite glass, to our knowledge, offering the common advantages of a robust oxide glass and an IR-transparent fluoride one. Besides optimized linear transmittance and absorption, the nonlinear refractive indices and Raman gain coefficients are reduced. These results are discussed in the context of mid-IR high-power laser generation and transmission.

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