掺镱多芯梯度折射率光纤及激光特性研究

项目名称： 掺镱多芯梯度折射率光纤及激光特性研究

项目编号： No.60808023

项目类型： 青年科学基金项目

立项/批准年度： 2009

项目学科： 建筑科学

项目作者： 邹快盛

作者单位： 中国科学院西安光学精密机械研究所

项目金额： 24万元

中文摘要： 本项目针对高功率光纤激光器应用提出一种掺镱多芯梯度折射率光纤，该光纤结合了梯度折射率材料的传光特性和掺入镱离子后可成为有源光纤的特性，比常规双包层掺杂光纤更易于实现大的单模芯径，从而实现更高功率和更高光束质量的激光输出。本项目对掺镱硅酸盐玻璃、掺镱氟铅硅酸盐玻璃、掺钕氟铅硅酸盐玻璃、掺镱梯度折射率玻璃、多芯掺镱梯度折射率光纤、全固态保偏光子晶体光纤和负折射率差导引大模场光纤进行了系统地研究，获得了数值孔径为0.29的梯度折射率玻璃、37芯掺镱梯度折射率光纤、2.36 ms的长荧光寿命和94.8 nm宽的荧光有效线宽掺镱激光玻璃，并在此基础上制备了模场直径超过100μ#30340;负折射率差增益导引大模场光纤，实现了M2因子为2.9的准单模激光增益输出。掺镱多芯梯度折射率光纤和负折射率差增益导引光纤是一系列新技术、新工艺和新材料相结合的产物，是高功率光纤激光器的新的候选光纤，将有重要的应用前景。

中文关键词： 光纤激光器;掺镱多芯梯度折射率光纤;负折射率差增益导引;大模场;

英文摘要： This project presents a Yb-doped optical fiber with multi-gradient-index-core for high power fiber laser. The fiber core material with graded-index properties can become active fiber by doping ytterbium ions. Compared to conventional double clad fiber, the fiber is easy to realize large single-mode area, thereby achieving more high power and high beam quality laser output.In the project, we have systematically studied ytterbium doped silicate glass, ytterbium/neodymium doped lead fluorosilicate glass, ytterbium doped gradient index glass, ytterbium-doped multi-gradient-index-core fiber, all-solid polarization-maintaining photonic crystal fiber, “ain-guided index-antiguided”large-mode-area optical fiber. We have obtained a gradient refractive index glass with a numerical aperture of 0.29, a Yb-doped optical fiber with 37 graded-index-core, a ytterbium-doped lead fluorosilicate laser glass with 2.36 ms fluorescence lifetime and 94.8 nm fluorescence effective line-width. The “ain-guided index-antiguided”optical fiber was drawn by using the Yb3+-doped lead fluorosilicate glass. The diameter of single mode area is above 100μ Experimental demonstration of lasing in the fiber is presented with excellent beam quality. The M2-value is characterized to be less than 2.9. Two ytterbium-doped large-mode-area optical fiber with multi-gradient-index-core and gain-guided index-antiguided is combined with a series of new technologies, new processes and new materials. And they will have important application prospect as new candidate fiber for high-power fiber laser.

英文关键词： fiber laser; multi-gradient-index-core fiber;gain-guided index-antiguided;Large-mode-area;