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采用改进的化学气相沉积法制备掺Yb石英光纤预制棒,以该预制棒制备了尺寸为10/130μm的双包层掺Yb光纤,将这些光纤分成若干组,在不同剂量的60Coγ辐射源下辐照,测试了光纤在辐射前后的吸收谱和激光性能以及光纤预制棒切片辐照后的吸收.实验结果表明:光纤中已存在的色心缺陷(如氧空位(II))和辐照引起的色心缺陷(如E’心、过氧基以及Yb2+离子)等因素的叠加作用可能导致辐照后的光纤在可见光区域的吸收显著增大;与辐照前相比,辐照后光纤的斜率效率、光-光效率显著下降,剂量越大激光性能下降得越厉害;基于Power-Law定理拟合了光纤辐致损耗与所受剂量的关系曲线,定量分析了不同剂量辐照后光纤激光性能下降的原因.研究结果将为进一步发展抗辐照光纤提供理论和实验依据.
The Yb-doped silica optical fiber preform rods were prepared by a modified chemical vapor deposition method. The double-clad Yb-doped optical fibers with the size of 10 / 130μm were prepared by the preform rods. The fibers were divided into several groups and irradiated with different doses of 60Coγ radiation The absorption spectra and laser properties of the optical fiber before and after irradiation as well as the absorption after the irradiation of the optical fiber preform section were tested.The experimental results show that the existence of color center defects (such as oxygen vacancy (II)) and irradiation The combination of color center defects (such as E ’heart, peroxide and Yb2 + ions) may lead to a significant increase in the absorption of the irradiated optical fiber in the visible region. Compared with that before irradiation, the slope of the irradiated optical fiber Efficiency and optical-optical efficiency decreased significantly. The larger the dose, the worse the laser performance. Based on the Power-Law theorem, the relationship between the optical fiber loss and the dose was fitted and the laser performance The reasons for the decline.The results will provide theoretical and experimental basis for the further development of anti-irradiation optical fiber.