摘要
通过对PMMA塑料光纤中的主要损耗因素C -H谐波吸收进行了理论分析 ,并进行了定量计算 ,结果与实际测量数据一致 .并从理论上验证了氘化、氟化降低塑料光纤损耗的机理 .得到不同量子数的伸缩振动和弯曲振动的吸收波数和损耗 .随着波长的增加 ,C -H谐波吸收损耗增加 ,而伸缩振动的吸收损耗比弯曲振动高一个数量级 。
Absorption loss due to high harmonics of C - H vibrations, the primary loss factor in PMMA POF, was analyzed and calculated. And the results were consistent with measured datas. The mechanism that deuterating and fluorinating could decrease loss of POF was theoretically approved. Absorption wavenumber and loss of streching vibration and bending vibration of different quantum number were obtained. With increasing of wavelength, absorption loss due to high harmonies of C - H vibrations increased and absorption loss of stretching vibration was higher one order of magnitude than that of bending vibration, and both was in proportion to quantum number respectively.
