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为了探讨限制Ge-Sb-Se玻璃的航空红外系统和CO_2激光窗特性的非本征和本征吸收效应,研究Ge-Sb-Se玻璃的红外透过特性。已经发现非本征吸收是由氧化物和碳杂质引起的,采用通过石英蒸馏以及添加Al俘获剂的制备材料技术,消除了这些有害杂质。消除了强的非本征吸收,较弱的本征吸收就呈现出来了。长波长红外截止看来就由某些基谐振动型的较高次激发所决定,对于 Ge-Se键是在245厘米~(-1)附近,而对于Sb-Se键是在180厘米~(-1)附近。改变玻璃的成分,也能使8～12微米大气窗区吸收系数发生变化。这些变化是由于分子结构的畸变以及Ge、Sb和Se间键混合而产生的。在10.6微米处,吸收系数从0.024厘米~(-1)变化到0.008厘米~(-1)。
In order to investigate the extrinsic and intrinsic absorption of Ge-Sb-Se glass, the infrared transmission of Ge-Sb-Se glass was investigated. It has been found that extrinsic absorption is caused by oxides and carbon impurities, which are eliminated by the technique of preparation of the material by quartz distillation and addition of an Al-capturing agent. Elimination of strong extrinsic absorption, weaker intrinsic absorption is presented. The long-wavelength infrared cut-off appears to be determined by the higher excitation of some fundamental resonance modes, around 245 cm -1 for the Ge-Se bond and about 180 cm -1 for the Sb-Se bond -1) near. Change the composition of the glass, but also make 8 ~ 12 micron atmospheric window absorption coefficient changes. These changes are due to molecular structure distortion and Ge, Sb and Se intermixed by the bond generated. The absorption coefficient changes from 0.024 cm -1 to 0.008 cm -1 at 10.6 μm.