铒镱共掺光纤制备及其激光性能研究  

Fabrication of Erbium-Ytterbium Co-Doped Fiber and Fiber Laser Performance Study

作　　者：陈阳 褚应波 戴能利 李进延 Chen Yang;Chu Yingbo;Dai Nengli;Li Jinyan(Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan,Hubei 430074,China)

机构地区：[1]华中科技大学武汉光电国家研究中心,湖北武汉430074

出　　处：《中国激光》2021年第7期41-47,共7页Chinese Journal of Lasers

基　　金：国家自然科学基金青年科学基金(61805093);中国博士后科学基金(2017M612450)。

摘　　要：铒镱(Er^(3+)/Yb^(3+))共掺光纤是实现波长为1.5μm激光的重要增益介质之一。但是石英基Er^(3+)/Yb^(3+)共掺光纤很容易产生波长为1μm的放大的自发辐射(ASE)光,不仅降低1.5μm激光的泵浦转换效率,而且是限制1.5μm激光功率提升的“瓶颈”。研究结果表明,提升纤芯磷的掺杂量,能够增大纤芯基质的最大声子能量,有利于抑制Yb^(3+)的ASE光和Er^(3+)→Yb^(3+)的反向能量传递,从而提高Er^(3+)/Yb^(3+)共掺光纤的泵浦转换效率。通过改良的化学气相沉积制备工艺可以减少磷元素在高温条件下的挥发,从而成功制备出高掺磷的10/130μm双包层Er^(3+)/Yb^(3+)共掺光纤。测试光纤后向的1μmASE光谱随泵浦功率的变化,并且搭建两级激光测试平台,测得Er^(3+)/Yb^(3+)共掺光纤激光的斜率效率为35.5%。Objective Er^(3+)/Yb^(3+)co-doped fiber laser has attracted significant attention.It is widely applied in communication,military,medical,and scientific research fields.Er^(3+)/Yb^(3+)co-doped fiber laser operates at 1.5μm,which is located in the low-loss transmission window of silica fiber and considered as an eye-safe wavelength band.In Er^(3+)/Yb^(3+)co-doped fiber,Yb^(3+)ions,which act as an excellent sensitizer,have wide absorption bands of 800--1000 nm and high absorption intensity.When Yb^(3+)and Er^(3+)are sufficiently close,resonance energy transfer occurs between them,which improve the luminescence efficiency at 1.5μm.The introduction of Yb^(3+)also increases the distance between Er^(3+)and prevents Er^(3+)from forming clusters.However,the amplified spontaneous emission(ASE)at 1μm emitted by Yb^(3+)is inclined to give rise to the bottleneck effect of Er^(3+)/Yb^(3+)co-doped fiber lasers.The output power of 1.5-μm laser and the slope efficiency will be strongly diminished by the ASE of Yb^(3+).In this study,a series of technical solutions to alleviate ASE is proposed to achieve high efficiency Er^(3+)/Yb^(3+)co-doped fiber lasers.Most of the proposed methods focus on changing the structure of fiber lasers.However,optimizing the composition of the fiber core and fabricating high-performance Er^(3+)/Yb^(3+)co-doped fiber seems to be a more fundamental approach to suppress ASE.Thus,the Er^(3+)/Yb^(3+)co-doped fiber is prepared by modified chemical vapor deposition(MCVD)process combined with solution doping technology,and the Er^(3+)/Yb^(3+)co-doped fiber laser system is constructed.Finally,the output power and ASE spectra at different pump powers are investigated.Methods The MCVD and solution doping technologies are used to prepare fibers by introducing a large amount of phosphorus into the core.The refractive index profile(RIP)of the fiber is also analyzed by P104.Moreover,PK2500 is utilized to test the background loss and absorption coefficient of the fiber.The ASE test structure,as shown in Fig.4,is e

关 键 词：激光光学 铒镱共掺光纤 1.5μm激光 光纤激光器 改良的化学气相沉积 

分 类 号：O436[机械工程—光学工程]