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英国Plessey公司正研究CaLa_2S_4用作8～14μm窗材料的可能性。此工作分别得到英国国防部的支持和皇家信号与雷达研究所的资助。选择这种材料时考虑了以下因素:克服散射和透射损失所需的折射指数各向同性以及微晶间的不对称性、透射带、硬度和成本。用不同工艺制成纯净的料粉。重要的是,料粉中不应包含有吸收红外辐射的含氧杂质。料粉制成致密陶瓷,其制法为单轴热压法或一种三阶段工艺。后一
Plessey UK is studying the possibility of using CaLa_2S_4 as 8-14 μm window material. This work was supported by the UK Department of Defense and by the Royal Institute of Signal and Radar. The following factors are taken into account when choosing this material: Isotropy of index of refraction required to overcome scattering and transmission losses, as well as asymmetry between the crystallites, transmission band, hardness and cost. Made with different processes pure powder. It is important that the material powder should not contain oxygen-containing impurities that absorb infrared radiation. Powder made of dense ceramics, the system for the uniaxial hot pressing method or a three-stage process. After one