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采用有机/无机混合溶胶-凝胶法制作条形光波导,并将条波导接入光纤Sagnac环中,测量了输出光功率随环境气氛中乙醇蒸气体积分数变化的特性,表明在实验研究的范围内,输出信号与乙醇蒸气体积分数呈正弦变化.根据Sagnac环结构输出特性的基本关系,反映了溶胶-凝胶条波导在乙醇蒸气气氛下产生了双折射效应.观察到双折射相移与乙醇体积分数的亚线性关系.对实验数据拟合,计算了偏振相移的线性项和二次项系数,得到所制备的条波导的双折射对乙醇体积分数的响应为Δn≈4.4×10-2.测量了信号变化的时间演变特性,典型的上升和下降时间常数分别为3 min和12 min.
The strip-shaped optical waveguide was prepared by the organic / inorganic hybrid sol-gel method, and the waveguide was introduced into the fiber Sagnac ring to measure the change of the output optical power with the volume fraction of ethanol vapor in the ambient atmosphere. , The output signal and the ethanol vapor volume fraction change sinusoidally.The basic relationship between the output characteristics of the Sagnac ring structure reflects the birefringence effect of the sol-gel strip waveguide in the ethanol vapor atmosphere.It is observed that the birefringence phase shift and ethanol Volume fraction of the linear relationship between the experimental data fitting, calculated the linear phase shift of the polarization and the quadratic coefficient of the waveguide obtained birefringence ethanol volume fraction of the response Δn ≈ 4.4 × 10-2 The temporal evolution of signal changes was measured, with typical rise and fall time constants of 3 min and 12 min, respectively.