多芯分段错位掺杂微结构光纤的制备及其特性研究

项目名称： 多芯分段错位掺杂微结构光纤的制备及其特性研究

项目编号： No.11504320

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 数理科学和化学

项目作者： 陈月娥

作者单位： 燕山大学

项目金额： 24万元

中文摘要： 近年来，快速发展的高功率光纤激光器技术推动了高功率光纤激光器在科学研究、国防和工业加工中的应用，而高功率光纤激光器的核心元件-掺杂光纤的结构设计和制备工艺只为欧美少数国家所掌握，这成为限制我国高功率光纤激光器发展的瓶颈。微结构光纤由于其灵活的结构设计和高度可调的光学特性在高功率光纤激光器的研发中具有独特的优势。本项目采用理论分析与实验制备相结合的技术路线，首先在理论上分析利用多掺杂芯间倏逝波耦合实现激光自组织相干，利用分段错位掺杂、旋转拉制实现微结构光纤沿光纤轴向掺杂浓度渐变进而有效提高高功率光纤激光器的激光输出强度。其次基于Rsoft软件模拟寻求最佳的芯数、芯距、掺杂浓度、掺杂长度、旋转角度和错位距离。最后根据理论设计制作光纤预制棒，进一步利用光纤拉丝系统完成多芯分段错位掺杂微结构光纤的制备，在压力辅助下实现微结构光纤低损耗熔接进激光系统，实现高功率激光输出的目标

中文关键词： 微结构光纤；高功率激光器；倏逝波耦合；分段错位掺杂；压力辅助熔接

英文摘要： The rapid development of high power fiber laser technology and products in the world promoted the application of high power fiber lasers in industrial processing in China. The structures of high power fiber lasers and their key components - doped fibers are developed in the United States and a few European countries, as a result, doped fibers and manufacturing of high power fiber lasers have to be imported from foreign countries. Doped PCF structure design and manufacturing techniques became a bottleneck of development of high-power micro-structured fiber lasers. In order to overcome this problem and to realize high-power micro-structured fiber lasers with doped PCF made in China, studied on high-power fiber lasers are very necessary. This project adopted theory analysis and experiment technical route. First, laser self-organized coherent could gain by evanescent wave coupling of doped multi-core. Second，using piecewise dislocation and rotating pulling could gain doping concentration gradient along the fiber of micro-structure fiber in order to improve the laser output intensity of high power fiber lasers. Third,based on the Rsoft simulation tools, the relations among core numbers, core distance, doping concentration, doping length, rotation angle and dislocation distance were studied. Finally, using an improved intelligent control system, we completed from preform to PCF with small fiber degradation. With low-loss fusion splice of PCF into a fiber laser system using a pressure-aided method, we realized high-power laser output.

英文关键词： multi-core micro-structure fiber;high power laser;evanescent wave coupling;piecewise dislocation dopant;pressure auxiliary welding