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为克服光纤非线性效应和光纤损伤等对光纤激光功率增长的限制,高功率增益光纤通常采用大模场光纤结构。总结了目前大模场光纤实现的3条主要技术途径:光纤结构设计、模式选择控制和模式转换,说明各种技术途径的基本思想及主要光纤的特点,在此基础上,指出:这些方法真正应用到实际还面临着模场畸变、高阶模抑制、光纤激光系统综合分析以及光纤加工工艺等需要克服的技术难题。最后,从光纤的性能特点、加工难易程度以及研究的理论和实验水平几方面综合比较,高阶模光纤的模式转换法和基于增益控制的反折射率导引方式是实现大模场光纤激光的两种最有效的方法,其模场面积的提升具有较大的空间。
To overcome the non-linear effects of fiber and fiber damage on the fiber laser power growth constraints, high-power gain fiber is usually used in the large mode field fiber structure. Summarizes the three main technical ways that the present large-mode field optical fiber realizes: optical fiber structure design, mode selection control and mode conversion, illustrating the basic ideas of various technical approaches and the characteristics of the main optical fibers. On this basis, it is pointed out that these methods are truly Applied to the actual face of mode field distortion, high-order mode suppression, fiber laser system analysis and optical fiber processing technology need to overcome the technical problems. Finally, from the performance characteristics of optical fibers, ease of processing and the theoretical and experimental level of several aspects of comprehensive comparison, high-mode optical fiber mode conversion and gain control based on the refractive index of the guide mode is to achieve large-mode fiber laser two The most effective method, the mode field area to enhance a larger space.