光敏光纤光致折射率增量与曝光量关系的研究

Study on the Relationship Between Photo-induced Index Increment of Photosensitive Fiber and its Dose

在色芯模型和前人工作的基础上,提出了新的假设,推导出光敏光纤光致折射率增量Δn与曝光量I的变化关系式。按多项e负指数之和变化的规律。利用非平衡Mach Zehnder光纤干涉仪(MZI)对C598 302(s)型光敏光纤Δn与I 的变化关系进行了实验测量,实验结果与理论公式吻合;同时,测量得到C598 302(s)型光敏光纤最大光致折射率增量Δn可达到1.757 4×10-3。

To describe the relationship between photo-induced index increment Δ n of photosensitive fiber and its dose the formula has been deduced based on a new assumption of the “color-center model”.The formula is in the form of multi-decaying exponential functions.The relationship between Δ n of C_598-302(s) photosensitive fiber and its dose has been measured using an unbalanced Mach-Zehnder fiber interferometer.The results show the formula is a good fit for the experiment,and the maximum index increment of C_598-302(s) photosensitive fiber can attain to 1.757 4×10^(-3).