高功率高效率中红外波段掺铒氟化物光纤激光器研究进展(特邀)  

High-Power and High-Efficiency Mid-Infrared Er-Doped Fluoride Fiber Lasers(Invited)

作　　者：史伟[1,2] 张露[1,2] 付士杰 盛泉[1,2] 张钧翔[1,2] 姚建铨 Shi Wei;Zhang Lu;Fu Shijie;Sheng Quan;Zhang Junxiang;Yao Jianquan(School of Precision Instrument and Optoelectronics Engineering,Tianjin University,Tianjin 300072,China;Key Laboratory of Opto-Electronic Information Technology,Ministry of Education(Tianjin University),Tianjin 300072,China)

机构地区：[1]天津大学精密仪器与光电子工程学院,天津300072 [2]天津大学光电信息技术教育部重点实验室,天津300072

出　　处：《中国激光》2024年第19期53-65,共13页Chinese Journal of Lasers

基　　金：国家自然科学基金(62375201,62275190,62105240,62075159);山东省重点研发项目(2020CXGC010104,2021CXGC010202);天津市自然科学基金(23JCQNJC01740);天津大学自主创新基金(2023XPD-0020)。

摘　　要：以稀土离子掺杂光纤为增益介质的中红外光纤激光光源凭借其高输出功率、高光束质量及稳固紧凑的系统结构,在国防、医疗以及前沿科学研究等领域具有广阔的应用前景。掺铒氟化物光纤体系具有2.8μm和3.5μm两个重要的中红外发射带,其凭借着兼容半导体激光直接泵浦的便捷性以及成熟的光纤材料基础,成为中红外激光技术领域的重要研究方向。本文系统综述了中红外连续波掺铒氟化物光纤激光器的近期研究进展,对其在输出功率和效率提升以及工作波长拓展方面的代表性研究成果进行了梳理和回顾,并围绕现阶段的瓶颈限制简要展望了中红外掺铒氟化物光纤激光器的未来发展趋势。Significance Mid-infrared lasers operating in the wavelength region of 2.5‒5.0μm,which overlap both the atmospheric window and the so-called molecular fingerprint region,have found a growing number of applications in defense,medical treatment,and advanced scientific research.Compared with other laser sources,rare-earth-ion-doped fiber lasers exhibit the advantages of power scalability,wavelength tunability,thermal management,and beam quality,and are thus a promising approach for generating highpower mid-infrared laser emission.Of the different types of mid-infrared rare-earth-doped fiber lasers,Er-doped fluoride fiber lasers are the most studied because they can be conveniently pumped by laser diodes and have a mature fiber material base.Er ions provide two significant mid-infrared emission bands in fluoride glass hosts,namely,~2.8 and~3.5μm,which correspond to^(4)I_(11/2)→^(4)I_(13/2)and^(4)F_(9/2)→^(4)I_(9/2)transitions,respectively.With the development of ZBLAN fibers and ZBLAN fiber-based devices,the performance of midinfrared Er-doped ZBLAN fiber lasers has benefitted significantly.In this study,we review the recent research progress of 2.8μm and 3.5μm continuous-wave(CW)Er-doped fluoride fiber lasers,including improvements in output power scaling,efficiency,and wavelength extension.Progress For 2.8μm Er-doped fluoride fiber lasers,output power scaling has been mostly limited by the self-termination of^(4)I_(11/2)→^(4)I_(13/2)transition induced by the long lifetime of the lower laser level.The most popular approach to depopulate the lower laser level is to use heavily Er-doped fluoride fibers(typically>7%)via the strong energy upconversion transfer(ETU)process(Fig.2).In a previous study,a record output power of 41.6 W was obtained using this approach in a dual-end pumped Er-doped fluoride fiber laser;to date,this remains the highest mid-infrared laser output power obtained from rare-earth-doped fibers(Fig.3).However,the high quantum defect-induced heat accumulation subjects the fiber tip to ther

关 键 词：激光器 中红外激光 氟化物光纤激光器 铒离子 

分 类 号：O436[机械工程—光学工程]