27 February 1980 Development Of Fluorophosphate Optical Glasses
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The requirements of high-energy laser systems have stimulated the development of low-refractive index, low-dispersion optical glasses, thus extending the range of available glasses in the Abbe diagram. Fluorophosphate glasses are the prime candidates to meet these requirements, but their preparation is complicated by fluorine volatilization on melting and devitrification and cracking on casting. The latter difficulties are caused by low viscosity at the crystallization temperature and by high thermal expansion. Exploration of glassforming regions and simultaneous optimization of the optical properties has led to the identification of compositions with commercial potential. A representative 100-gram melt contained 60 mol % RF2 (R = Mg, Ca, Sr, Ba), 36.7 mol % A1F3' 3.3 mol % Al(P03)3' with nD = 1.439 and vD = 95. After annealing it was optically homogeneous and strain-free.
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J. T. Wenzel, J. T. Wenzel, D. H. Blackburn, D. H. Blackburn, W. K. Haller, W. K. Haller, S. Stokowski, S. Stokowski, M. J. Weber, M. J. Weber, } "Development Of Fluorophosphate Optical Glasses", Proc. SPIE 0204, Physical Properties of Optical Materials, (27 February 1980); doi: 10.1117/12.958147; https://doi.org/10.1117/12.958147


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