本文利用格林函数和图展开方法,提出了无序材料(如玻璃)中的电磁耦合场量子理论,并由此计算和分析了SiO_2和GeO_2玻璃中光的瑞利散射及各种无序对散射贡献的大小,证实了虚温度近似中关于玻璃的瑞利散射主要起源于原子密度无序涨落的假设.本文仔细地考虑了电磁耦合场量子色散对瑞利散射损耗的影响.计算表明:对SiO_2和GeO_2玻璃,在最小损耗波长,由色散引起的偏离瑞利散射λ~(-4)规律的相对误差分别为20%和11%.

A theory of polaritons in disordered materials is proposed with the help of Green functions and diagrammatic methods. Rayleigh scatterings in SiO2 and GeO2 glasses are calculated and the magnitudes of contributions to Rayleigh scattering from different disorder mechanisms are analysed based on the theory, which verifies the assumption in the fictive temperature approximation that Eayleigh scatterings in glasses come mainly from the density fluctuations in the glass solutions. The Rayleigh scatterings as well as the effecie of polariton dispersions on the losses are calculated for SiO2 and GeO2 glasses. The results show that at the minimum loss wavelengths, the relative deyiations of the Rayleigh scattering losses caused by ihe dis persion effects from the λ-4 law are 20% and 11% for SiO2 and GeO2 glasses respectively.