Tm^(3+)掺杂硫卤玻璃光纤的中红外增益特性研究  

Preparation of thulium-doped chalcohalide glass fibers and theoretical analysis on the mid-IR gain characteristics

作　　者：牛雪珂[1] 戴世勋[1] 周亚训[1] 张培晴[1] 许银生[1] 王训四[1] 

机构地区：[1]宁波大学信息科学与工程学院红外材料及器件实验室,浙江宁波315211

出　　处：《光电子．激光》2013年第4期720-726,共7页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(61177087);教育部新世纪优秀人才计划(NCET-10-0976);浙江省杰出青年基金(R1101263);浙江省自然科学基金(LQ12F05004);宁波市新型光电功能材料及器件创新团队(2009B21007);宁波市自然科学基金(2012A610116);宁波大学王宽诚幸福基金资助项目

摘　　要：采用高温熔融淬冷法制备了1%Tm3+掺杂的72GeS2-18Ga2S3-10CsI(GGSI)硫卤玻璃,测试了样品的折射率、吸收光谱和800nm激光泵浦下的中红外荧光光谱,利用Judd-Ofelt和Futchbauer-Ladenburg(FL)理论分析计算了Tm3+在GGSI玻璃中的自发辐射几率、荧光分支比、辐射寿命、吸收截面、发射截面等光谱参数,进而建立了Tm3+的四能级粒子数速率-光功率传输方程模型,模拟计算Tm3+掺杂GGSI玻璃光纤中红外3.73μm波段的增益与掺杂光纤长度、泵浦功率和信号功率的关系。模拟结果显示,硫卤玻璃基掺铥光纤具有较高的信号增益和较宽的中红外增益谱,泵浦功率为1 000mW时,最大小信号增益值达到30dB,20dB增益带宽达到180nm,同时也存在合适的泵浦功率和光纤掺杂长度以期获得最佳信号增益。表明Tm3+掺GGSI硫卤玻璃光纤可作为中红外3.73μm波段放大的理想增益介质。lwt% Tm3＋-doped 72GeS2-18Ga2S3-10CsI （GGSI） chalcohalide glasses are synthesized by vacuumed melting-quenching technique and the properties of glasses including refractive index, absorption spectrum,mid-infrared （IR） emission spectrum under 800 nm exicitation are measured. The optical pa rameters, such as predicted spontaneous transition probability （A） ,branching ratio （β）, radiative lifetime （rnd） ,absorption cross-section （aa） and emission cross-section （ae） ,by means of Judd-Ofelt and Fuch- bauer-Ladenburg theories are calculated. Based on the rate equations and power propagation equations, the Tm3＋ -doped CKSI glass fiber amplifier modeling is analyzed and the numerical simulations on wave- length of 3.73/lm mid-infrared gain characteristics versus the fiber length,pump power and signal power are discussed in this paper. It is shown that the Tm3＋-doped chalcohalide glass fiber exhibits a higher signal gain and broad mid-infrared gain spectrum：its maximum gain of small signal and the gain width at 20 dB reach 30 413 and 180 nm,respectively for pump power of 1 000 mW. Simulation results also show that there exist the most suitable pump power and fiber length while the amplifier has the maximum sig- nal gain. Theoretical study indicates that the Tm3＋ -doped C, GSI chalcohalide glass fiber is a suitable gain medium which can be applied to amplifiers in the mid-infrared wavelength region.

关 键 词：掺Tm3+硫卤玻璃光纤 中红外增益 速率-传输方程 数值模拟 

分 类 号：TN253[电子电信—物理电子学]