γ辐射对光纤波导电磁场分布的影响  

Influence of gamma-ray radiation on electromagnetic field distribution of optical fiber waveguide

作　　者：刘福华[1] 王平[2] 陈绍武[2] 刘卫平[2] 谢红刚[2] 王振宝[2] 

机构地区：[1]西安电子科技大学技术物理学院,西安710071 [2]西北核技术研究所激光与物质相互作用国家重点实验室,西安710024

出　　处：《强激光与粒子束》2013年第7期1788-1792,共5页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(11275148)

摘　　要：开展了光纤波导中的电磁场传输理论分析,得到了光纤折射率变化对波导中电磁场分布的影响规律,建立了块状融石英材料及光纤光栅在60 Coγ辐射作用下折射率变化的测量系统,开展了折射率随辐射剂量变化及光纤模场测量实验。结果表明:光纤的折射率随γ辐射剂量的增加而增大,折射率的变化会引起波导中传输模式的场强分布变化,从而导致光纤的辐射感生波导损耗;在一定的辐射剂量范围(0～2000Gy)内,光纤仍满足弱导边界条件,能够维持对传输模式的约束能力。The electric field of the transmission mode in an optical fiber waveguide is analyzed theoretically. The discipline describing the influence of optical fiber refractive index changes on waveguide electromagnetic field distribution is obtained. A real time experimental measurement system of refractive index changes has been built by using bulk fused silica material and fiber Bragg grating under 0 Co γ ray radiation. The refractive index changes of two candidates with given radiation doses and mode field of fiber are measured in the experiments respectively. The results show that the refractive index of the optical fiber increases with the γ radiation dose; the refractive index changes cause the variations of the field intensity distribution in the transmission mode, which results in radiation induced waveguidc losses; within a certain dose range of 0-2000 Gy, the optical fiber meets the weakly guiding boundary conditions and maintains the confining ability on the transmission mode.

关 键 词：Γ辐射 光纤波导 折射率 模场分布 感生波导损耗 

分 类 号：TN253[电子电信—物理电子学]