光纤的激光微结构加工及对强度的影响

摘要

在光纤传感器的工程应用中，光纤的应力变化是一个不容忽视的因素。通过有限元法分析了带有不同微孔光纤达到屈服强度时的最大轴向张力以及负载相同时微孔大小对光纤应力的影响。简要介绍了准分子激光加工光纤微结构的方法；基于有限元分析结果利用157nm深紫外激光在光纤上进行了多组微结构加工实验，证实了157nm激光在制备新型光纤传感器方面的实用性。%The change of fiber stress is an important factor in the engineering applications of fiber optic sensors. In this paper, finite element method was employed to calculate the maximum axial tension when the fibers reached its yield intensity with different micro-holes, and the effects of the micro-hole size on fiber stress were analyzed under the same loads. The microstructure processing method using excimer laser are briefly introduced. Based upon the results of finite element analysis, a series of micromachining experiments of optical fiber were performed using 157 nm DUV laser. The practicability of 157 nm laser in the preparation of new-type fiber optic sensors is demonstrated.