连续光泵浦纵向异构型碲酸盐玻璃非线性光纤产生大功率中红外超连续谱

项目名称： 连续光泵浦纵向异构型碲酸盐玻璃非线性光纤产生大功率中红外超连续谱

项目编号： No.61475171

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 无线电电子学、电信技术

项目作者： 廖梅松

作者单位： 中国科学院上海光学精密机械研究所

项目金额： 78万元

中文摘要： 中红外超连续谱光纤光源在医学手术、红外电子对抗、传感等领域有潜在重要应用价值，然而平均功率不足使其实际应用受到很大限制。1.95微米连续铥光纤激光器平均功率高、技术成熟，很适合作为泵浦源泵浦非线性光纤产生大功率中红外超连续谱。但是，在此超连续谱产生机制下，对非线性光纤的色散、非线性、损耗、端面损伤阈值等有很严苛的要求。 我们提出一种纵向异构的非线性光纤方案以满足上述要求。光纤沿长度方向根据结构的不同分为三段，分别为芯径渐减的全固态复合微结构、氩气孔复合微结构和阶跃型微结构。拟采用碲酸盐玻璃做为光纤材料。与氟化物玻璃相比，该玻璃非线性高10倍左右，更耐高温，化学稳定性更好，色散条件与采用的泵浦机制更匹配。 我们拟解决这一方案涉及的碲酸盐玻璃材料、中红外微结构光纤的设计与制作、连续光泵浦超连续谱向中红外的拓展机理等方面的基础理论问题与关键技术，实现数十瓦量级的大功率中红外超连续谱。

中文关键词： 超连续谱；光子晶体光纤；微结构光纤；中红外；非线性

英文摘要： Mid-infrared supercontinuum fiber source has important potential applications in medical surgery, infrared electronic warfare, and sensing technology. But its practical apllications are quite limited due to the low average power. 1.95μm CW fiber laser can have a high average power and is mature in technology. It is very suitable to be the pump source of high power mid-IR supercontinuum generation. However, in this regime the requirements for fiber disperison, nonlinearity, loss, and damage threshold are very stringent. We propose a nonlinear fiber with longitudinally heterogeneous microstructure to meet the above requirements. The fiber has three sections along the fiber length, which are all-solid composite microstructure with decreasing fiber diameter, composite microstructure with argon holes, and step-index microstructure, respectively. The fiber will be made of tellurite glass. Compared with fluoride glass, it has a nonlinearity higher about ten times, and can withstand much higher temperature. The chemical stability is preferable, and the dispersion matches better with the pumping scheme. We intend to address the basic theories and key technologies which are relationship to this project in the field of the tellurite galss materials, the mid-IR microstructured fiber design and fabrication, and the mid-IR SC broadening mechanisms in the CW regime. Mid-IR supercontinuum laser with the power of several tens of watt will be realized.

英文关键词： supercontinuum;photonic crystal fiber;microstructured fiber;mid-infrared;nonlinearity