用于3.9 μm中红外光纤激光器的Ho3+掺杂InF3基玻璃光纤研究

3~5μm波段中红外激光在国防安全、空间通信、环境污染监测、基础科学研究等领域具有广泛的应用前景。目前研制3~5μm波段光纤激光器所用的增益介质主要为稀土掺杂ZrF4基（ZBLAN）玻璃光纤。利用稀土掺杂ZBLAN光纤可以实现瓦级的3~3.5μm激光，但是ZBLAN玻璃较高的声子能量限制了利用其研制高性能的3.9μm光纤激光器。与ZBLAN玻璃相比，InF3基玻璃具有更低的声子能量，是潜在的可用于研制3.9μm光纤激光器的玻璃材料，但目前还未见相关瓦级的3.9μm光纤激光研究报道。本项目拟在申请者前期工作的基础上，通过研究玻璃组分、Ho3+离子掺杂浓度对3.9μm发光性质的影响，研究原材料纯度及光纤制备工艺对光纤损耗的影响，制备出损耗小于0.1dB/m的Ho3+掺杂InF3基玻璃光纤，并探索其在3.9μm中红外光纤激光器研制方面的应用。

3~5μm mid-infrared lasers have extensive application prospects in the domains of national defense security, space communication, environmental pollution monitoring, and basic scientific research. The gain fibers for developing 3~5μm fiber lasers are mainly rare-earth doped ZrF4-based (ZBLAN for short) glass fibers at present. Watt-level 3~3.5μm lasers could be obtained by using rare-earth doped ZBLAN fibers, however the high phonon energy of ZBLAN glass limits the development of 3.9μm fiber laser with high performance. Compared to ZBLAN glass, InF3-based glass has lower phonon energy and is potential glass material for the development of 3.9μm fiber laser, however there is no report of watt-level 3.9μm fiber laser based on InF3-based glass fibers until now. In this project, we are planning to fabricate Ho3+-doped InF3-based glass fibers with loss less than 0.1dB/m based on our preliminary work, by investigating the effects of material purity, fabricating technology on fiber loss, the effects of glass composition, Ho3+ concentration on 3.9μm emission properties. And we are planning to explore the application of Ho3+-doped InF3-based glass fibers in the development of 3.9μm mid-infrared fiber laser.