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首页> 外文期刊>Applied optics >Formation of enhanced regenerated grating in few-mode fiber by CO2 laser pretreatment
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Formation of enhanced regenerated grating in few-mode fiber by CO2 laser pretreatment

机译：CO2激光预处理在少量纤维中形成增强再生光栅

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In this work, we experimentally investigated the effect of CO2 laser pretreatment on regenerated grating formulated in few-mode fibers (FMFs) (two-mode and four-mode step-index fibers). In the preparation, the pristine FMFs were first treated with direct CO2 laser annealing followed by a slow cooling procedure to minimize the frozen-in stresses and the thermal stresses in the fibers before the grating inscription. After the thermal regeneration process, the produced regenerated gratings (RGs) were then subject to a thermal durability test at 1050 degrees C for 10 h. In the comparison against the results from the RGs formulated in non-treated FMFs, the finding indicates that RGs in treated fibers have a better regeneration ratio and thermal resilience. It is believed that the thermal stress relaxation and structural rearrangement in the fiber glass are the major factors that lead to the lower grating recovery during the state of thermal regeneration process and higher degradation in the grating strength in a longer exposure period. The elimination and reduction of stresses in the fibers by the laser pretreatment in the earliest stage enables the grating to be formed in a more thermal stable condition, hence, RGs with prolonged lifespan can be produced. (c) 2017 Optical Society of America
机译：在这项工作中，我们通过实验研究了CO2激光预处理在少量模式纤维（FMFS）（双模和四模阶梯纤维）中配制的再生光栅的影响。在制剂中，首先用直接CO 2激光退火处理原始FMFs，然后进行缓慢的冷却过程，以在光栅题字之前最小化纤维中的纤维中的冻结应力和热应力。在热再生过程之后，将产生的再生光栅（RGS）在1050℃下进行热耐久性测试10小时。在对非处理过的FMF中配制的RG的结果的比较中，发现表明处理过的纤维中的RGS具有更好的再生比和热弹性。据信，纤维玻璃中的热应力松弛和结构重排是在热再生过程状态下导致较低光栅回收的主要因素，并且在更长的曝光期间在光栅强度中的更高降解。通过激光预处理在最早阶段的消除和减少纤维的应力使得能够在更热稳定的条件下形成光栅，因此可以生产具有延长寿命的RG。 （c）2017年光学学会

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