Lai Man-Hong, Gunawardena Dinusha S, Lim Kok-Sing, Yang Hang-Zhou, Ahmad Harith
Opt Express. 2015 Jan 12;23(1):452-63. doi: 10.1364/OE.23.000452.
In this work, we have demonstrated for the first time grating regeneration in hydrogenated fibers by direct CO(2) laser annealing. During the annealing process, the center wavelength redshifts as the intensity of the focused CO(2) laser on the grating is elevated. The reflectivity of the grating begins to decay as the temperature induced in the grating approaches the erasure temperature. The grating is completely erased and regenerated afterwards. The observed spectral results have provided the proof of occurrence of dehydroxylation and stress relaxation in the fiber core during the annealing process. Regenerated gratings with low loss, good temperature sensitivities and sustainability have been successfully developed by this technique.
在本工作中，我们首次通过直接二氧化碳激光退火在氢化光纤中实现了光栅再生。在退火过程中，随着聚焦在光栅上的二氧化碳激光强度升高，中心波长发生红移。当光栅中感应的温度接近擦除温度时，光栅的反射率开始下降。之后光栅被完全擦除并再生。观察到的光谱结果证明了退火过程中光纤纤芯发生了脱羟基和应力松弛现象。通过该技术已成功制备出具有低损耗、良好温度敏感性和稳定性的再生光栅。
