Preparation and Properties of Heavy-Metal Fluoride Glasses Containing Ytterbium or Lutetium |
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| Authors: | M G Drexhage O H El-Bayoumi CT Moynihan A J Bruce K-H Chung D L Gavin T J Loretz |
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| Affiliation: | Solid State Sciences Division, Rome Air Development Center, Hanscom AFB, Massachusetts 01731;Department of Materials Engineering, Rensselaer Polytechnic Institute, Troy, New York 12181;Galileo Electro-Optics Corporation, Sturbridge, Massachusetts 01518 |
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| Abstract: | Beginning with a 19BaF2?27ZnF2?27YbF3?27ThF4 (mol%) base glass, compositional modifications were made to improve optical properties and glass-forming ability. Replacement of YbF3 by LuF3 removed a strong near-ir electronic absorption band, and small additions of LiF and NaF improved glass quality. The multicomponent BaF2/ThF4 glasses had higher refractive indices and lower expansion coefficients than fluorozirconate and fluorohafnate glasses. In the 6 to 10 μm region, these materials exhibit absorption coefficients an order of magnitude lower than those reported for other heavy-metal fluoride glasses. |
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