空芯波导用SiO2—TiO2—GeO2涂层的红外反射光谱分析

指出对于SiO2-TiO2凝胶玻璃涂层，即使TiO2含量高达80%，其对CO2激光波长(10.60μm）的IR反射率值仍很低。而对于SiO2-TiO2-GeO2涂层，当GeO2的含量从20%增加到30%时，其反射率峰逐步移向CO2激光波长，且在10.6μm处获得了20%的反射率。但当GeO2含量超过35%后，其IR反射率降低到几乎为零。因此，40SiO2-30TiO2-30GeO2的凝胶玻璃涂层是较理想的。

IR Reflectivity Spectra Analysis of Solgel SiO2-TiO2-GeO2 Coatings in Hollow Waveguide

It is shown that the IR reflectivity of SiO2-TiO2 gel glass coating was very low at the wavelength of CO2 laser (10.6 μm) although the content of TiO2 was as high as 80 %.In terms of SiO2-TiO2-GeO2 gel glass coating,its peak gradually moved to the wavelength of CO2 laser and the reflectivity finally reached 21 % at 10.6 μm when the content of GeO2 increased from 20 to 30 %.However,when the content of GeO2 was beyond 35 % the IR reflectivity almost reached zero.Therefore,the gel glass coating of 40SiO2-30TiO2-30GeO2 is a good candidate material in application.