实现2μm超短脉冲激光输出的掺铥锗酸盐玻璃光纤研究

The 2μm mid-infrared femtosecond laser has important applications in the field of civil and military. Due to limitation of the matrix characteristics of silica fiber, it is difficult to get 2μm ultrashort pulse laser output in silica glass fiber up to now. In ordr to overcome the technical difficulties in the current lack of 2μm femtosecond laser materials with good properties, the project aims to investigate a thulium doped germanate glass fiber for 2μm ultrashort pulse laser.The limitation of thermal, physicochemical, emission and laser properties of fiber materials will be solved, and the fiber combination properties will also be optimized by designing the fiber core and cladding component and adjusting the fiber properities. Thulium doped germanate glass with high 2μm emission cross section and long fluorescence lifetime will be obtained by studying the effect of fiber component and thiulum doping concentration on 2μm emission properties and energy transfer mechanism. Low loss and double cladding thulium doped germanate glass fiber will be obtained by studying the preparation technology of perform and fiber. Fiber laser performance will be deeply analyzed. The final purpose of the this research is to achieve the 2μm milliwatt level femtosecond fiber laser output. The present research rusults will provide a new choice for 2μm femtosecond fiber laser materials. It will also provide important research ideas and technical references for the development of the mid-infrared fiber laser materials and devices.

中红外2μm飞秒激光光源在民用及军事领域具有重要应用，由于石英光纤自身材料性能限制，难以在石英玻璃光纤中实现2μm超短脉冲激光输出。针对目前缺乏性能优良的2μm飞秒光纤激光材料这一技术瓶颈问题，本项目拟开展一种可实现2μm超短脉冲激光输出的掺铥锗酸盐玻璃光纤研究。通过光纤包层与纤芯组分设计与性能调控，解决光纤材料热学、物化、光谱与激光性能限制，实现光纤材料综合性能匹配与优化。通过光纤组分、铥浓度对铥离子2μm发光特性与机理的研究，获得具有2μm发射截面高、荧光寿命长的掺铥锗酸盐玻璃材料。在此基础上，通过锗酸盐光纤预制棒和光纤制备技术的研究，获得低损耗双包层结构玻璃光纤。通过对光纤激光输出特性进行深入研究，最终实现2μm米波段毫瓦级飞秒脉冲激光输出。本项目研究结果将为2μm飞秒激光光纤材料提供新的增益基质选择，对我国中红外光纤激光材料与器件等相关技术和产业的发展提供重要的研究思路与技术参考。

中红外2μm飞秒激光光源在民用及军事领域具有重要应用，由于石英光纤自身材料性能限制，难以在石英玻璃光纤中实现2μm超短脉冲激光输出。针对目前缺乏性能优良的2μm光纤激光材料这一技术瓶颈问题，本项目研究一种可实现2μm脉冲激光输出的掺铥锗酸盐玻璃光纤。通过2μm发光特性与机理的研究，获得具有2μm发射截面高（9.3×10-21cm2）、非辐射弛豫跃迁几率低（0.09ms-1）的掺铥锗酸盐玻璃材料。通过光纤包层与纤芯组分设计与性能调控，实现光纤材料综合性能匹配与优化。在此基础上，通过锗酸盐光纤预制棒和光纤制备技术的研究，获得低损耗双包层结构玻璃光纤。通过对光纤激光输出特性进行深入研究，最终实现2μm米脉冲激光输出。本项目研究结果将为2μm飞秒激光光纤材料提供新的增益基质选择，对我国中红外光纤激光材料与器件等相关技术和产业的发展提供重要的研究思路与技术参考。