基于掺铥光纤随机光栅的2μm随机激光器研究

Optical fiber-based random lasers and lasers at 2μm are both current research hot areas in the world range. Based on the frontier of international research and some findings from previous studies by ourselves, this project is proposed to study and develop novel Thulium-doped fiber based random lasers with output wavelength at 2μm. We will use the advanced fs laser technology and UV-laser fiber Bragg grating fabrication technology to make random fiber grating structures on a thulium-doped fiber, leading to random distributed feedback of light in the fiber to generate random laser at 2μm. We will study the basic principles of the interaction between the optical localization effect inctroduced by random gratings and the generation of random lasers, theoretically and experimentally. Furthermore, we will optimize the structures of both random gratings and laser setups to develop a 2μm random fiber laser with low threshold power, high slope efficiency and high output power. The new technology is expected to be used in the rapidly-developed laser machining and other related areas.

光纤随机激光器与2μm波段光纤激光器都是目前国内外激光器领域研究的热点。本项目立足国际研究前沿，在充分前期研究的基础上，提出基于掺铥光纤随机光栅的2μm随机光纤激光器理论与实验研究。项目拟采用先进的飞秒激光加工和紫外激光光纤光栅制备技术，在掺铥光纤上制备获得不同结构的随机光栅以引入随机分布光反馈，从而克服光纤在该波段瑞利散射系数减弱、损耗增加的影响，实现2μm随机激光输出。我们将通过深入的理论分析与数值模拟，结合具体的实验测量数据，充分揭示随机光栅的光局域效应对随机激光的形成及性能产生的影响与作用机制，在此基础上，结合随机光栅和激光器结构的优化设计，研制具有低泵浦阈值、高斜率效率、高输出功率的2μm光纤随机激光器，以期填补国内外技术空白，并逐步用于快速发展的激光加工及其它应用领域。

光纤随机激光器与2μm波段光纤激光器是国内外激光器领域研究的热点。本项目立足国际研究前沿，开展了基于掺铥光纤和随机光栅的2μm随机光纤激光器理论与实验研究。项目采用先进的飞秒激光加工和紫外激光光纤光栅制备技术，制备获得不同结构的光纤随机光栅作为光纤随机激光器的随机分布光反馈介质，克服了光纤在该波段瑞利散射系数弱、损耗大的困难，实现了2μm随机激光的输出。项目研究通过深入的理论分析，结合具体的实验设计和数据测量，揭示了光纤随机激光器中随机光栅的光局域效应对随机激光的形成及性能影响，在此基础上进行激光器结构的优化设计，研制出具有低泵浦阈值的单波长和多波长2μm光纤随机激光器，填补了国内外技术空白，可望在快速发展的激光加工及成像等技术领域获得应用。