红外用CVD ZnS多晶材料的研制

Preparation of CVD ZnS polycrystalline material for infrared optics

论述了制备红外用CVD ZnS多晶材料的化学气相沉积工艺和热等静压处理工艺。针对CVD ZnS多晶材料具备优良的光学和力学性能,采用化学气相沉积工艺和热等静压处理技术成功研制出大尺寸多晶材料,其最大尺寸达到250 mm×15 mm。测试了CVD ZnS样品的各项光学、力学性能指标。样品的全波段透过率均接近ZnS材料的本征水平,折射指数均匀性优于2×10-5,在1.06μm的吸收系数为2×10-3cm-1,抗弯强度达到104 MPa。

Chemical vapor deposited zinc sulfide （CVD ZnS） is a long-wave infrared material with excellent optical and mechanical properties. CVD ZnS windows and domes with bulk size up to 250 mm × 15 mm were prepared by chemical vapor deposition and hot isolated pressing. Technical issues for preparation of CVD ZnS, including chemical reaction, hot isolated pressing, control of flow pattern and equipment, are discussed. Optical and mechanical properties of CVD ZnS were measured and analyzed. The full-band transmittance of the samples is close to the theoretical value of ZnS, the inhomogeneity of refractive index at 0. 6328 μm is less than 2 × 10^-5, the bulk absorption at 1.06 μm is 2 × 10^-3cm^-1 and bending strength is 104 MPa. The result indicates that the quality of CVD ZnS is similar to that of American products.