19 December 1986 Current and Future Development of Calcium Lanthanum Sulfide
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Transparent samples of CaLa2S4 have been produced with good optical imaging characteristics and no significant impurity absorption bands between the intrinsic absorption edges. However, the optical transmittance of CaLa2S4 is still not adequate due to scattering and broadband absorption. Processing studies to improve the optical transmittance have concentrated on powder sulfurization, milling, and sintering. The best optical quality samples achieved to date have been fabricated using powder consisting primarily of CaSO4 and La2O2S, milled with burundum media, and sintered at 1150°C. The rain erosion resistance of CaLa2S4 has been shown to be substantially better than that of ZnS.
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K. J. Saunders, K. J. Saunders, T. Y. Wong, T. Y. Wong, T. M. Hartnett, T. M. Hartnett, R. W. Tustison, R. W. Tustison, R. L. Gentilman, R. L. Gentilman, "Current and Future Development of Calcium Lanthanum Sulfide", Proc. SPIE 0683, Infrared and Optical Transmitting Materials, (19 December 1986); doi: 10.1117/12.936418; https://doi.org/10.1117/12.936418

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