中国激光, 2012, 39 (6): 0605002, 网络出版: 2012-05-16   

大模场面积双包层光纤光栅模式特性研究

Study of Mode Characteristics for Large-Mode-Area Double-Clad Fiber Gratings
作者单位
中国科学院上海光学精密机械研究所上海市全固态激光器与应用技术重点实验室, 上海 201800
摘要
分析了在大模场面积双包层光纤(LMA-DCF)上刻写光栅的技术要求和难点,采用相位掩模法在20/400 μm 的LMA-DCF上刻写了高反射率光纤布拉格光栅。针对大模场光纤中存在高阶模的可能性,通过调整单模光纤(SMF)入射光场和LMA-DCF芯径的相对偏移量,对LMA-DCF光栅中的传输模式特性进行了理论分析和模拟计算,并在实验研究中测量了偏移量不同时光栅的反射谱,观测到了相应的LP01模和LP11模的模场光斑分布。对LMA-DCF光栅的几种光谱测试方法进行了对比研究,分析了各种方法的优缺点。研究结果将为LMA-DCF光栅在高功率激光系统中的应用提供依据和参考。
Abstract
High-reflectivity fiber Bragg grating (FBG) is successfully inscribed on the 20/400 μm large-mode-area double-clad fiber (LMA-DCF) by the phase-mask method, and the relevant technical requirements and difficulty of the inscription technology are analyzed. Considering the possibility of existence of the high-order mode in LMA-DCF, the mode characteristics are theoretically simulated by altering the relative displacement between the fiber core of SMF and LMA-DCF. The grating reflection spectra of different relative displacements are experimentally measured and the corresponding light spots are obtained. Besides, the frequently-used measuring methods of spectrum of LMA-DCF Bragg grating are compared and their respective characteristics are analyzed. Research results will provide theoretical and experimental basis for the application of LMA-DCF in high-power laser systems.
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刘刚, 杨飞, 叶青, 刘琼, 蔡海文, 瞿荣辉, 方祖捷. 大模场面积双包层光纤光栅模式特性研究[J]. 中国激光, 2012, 39(6): 0605002. Liu Gang, Yang Fei, Ye Qing, Liu Qiong, Cai Haiwen, Qu Ronghui, Fang Zujie. Study of Mode Characteristics for Large-Mode-Area Double-Clad Fiber Gratings[J]. Chinese Journal of Lasers, 2012, 39(6): 0605002.

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