摘要
2.7-3.0μm波段激光在很多领域具有重要应用,为探索和发展该波段新型晶体材料,本文采用提拉法生长出Pr,Yb,Ho:GdScO_(3)晶体,通过共掺入Pr3+离子以达到衰减Ho^(3+):^(5)I_(7)能级寿命的目的.采用X射线衍射测试得到了晶体的粉末衍射数据,测量了拉曼光谱,并对晶体的拉曼振动峰进行指认,对Pr,Yb,Ho:GdScO_(3)晶体的透过光谱、发射光谱和荧光寿命进行表征.Yb^(3+)的最强吸收峰在966 nm,吸收峰半峰宽为90 nm;2.7-3.0μm波段最强发射峰在2850 nm,半峰宽为70 nm;Ho^(3+):^(5)I_(6)和^(5)I_(7)能级寿命分别为1094μs和56μs.与Yb,Ho:GdScO_(3)晶体相比,Yb^(3+)的吸收峰和2.7-3.0μm的发射峰半峰宽明显展宽,同时下能级寿命显著减小,计算表明Ho^(3+):^(5)I_(7)与Pr^(3+):^(3)F_(2)+^(3)H_(6)能级之间能实现高效的能量传递.以上结果表明Pr,Yb,Ho:GdScO_(3)晶体是性能更优异的2.7-3.0μm波段激光材料.
In order to explore and develop new crystal materials in the 2.7-3.0μm band,Pr,Yb,Ho:GdScO_(3)crystal are successfully grown by the Czochralski method for the first time.X-ray diffraction measurement is performed to obtain powder diffraction data.Raman spectra aree measured and the vibration peaks are identified.The transmission spectrum,emission spectrum and fluorescence lifetime of Pr,Yb,Ho:GdScO_(3)crystal are also characterized.The center of the strongest absorption band is at 966 nm with a half-peak width of 90 nm,which comes from the transition of Yb^(3+):^(2)F_(7/2)→^(2)F_(5/2).The absorption cross section of Yb^(3+)is calculated and the values at 966,973,985 nm are 0.62×10^(-20),0.60×10^(-20) and 0.58×10^(-20) cm^(2)respectively.The maximum emission peak is at 2850 nm and the half-peak width is 70 nm,the lifetimes of Ho^(3+):^(5)I_(6) and ^(5)I_(7) are measured to be 1094 and 56μs respectively,and the emission cross section at 2850 and 2935 nm are calculated to be 3.6×10^(-20) cm^(2)and 1.21×10^(-20) cm^(2),respectively.Comparing with Yb,Ho:GdScO_(3)crystal,the absorption peak of Yb^(3+)and the emission peak are both broadened,which are related to the increase of crystal disorder.The lifetime of the lower energy level decreases significantly.Furthermore,the energy transfer mechanism between Ho^(3+) and Pr^(3+) is analyzed,and the energy transfer efficiency between Ho^(3+):^(5)I_(7) and Pr^(3+):^(3)F_(2)+^(3)H_(6) is calculated to be 99%,which is higher than those in other materials.All the results show that Pr,Yb,Ho:GdScO_(3)crystal is an excellent 2.7-3μm laser material,and is easier to achieve laser output than Yb,Ho:GdScO_(3)crystal.
作者
孙贵花
†张庆礼
罗建乔
王小飞
谷长江
Sun Gui-Hua;Zhang Qing-Li;Luo Jian-Qiao;Wang Xiao-Fei;Gu Chang-Jiang(Anhui Provincial Key Laboratory of Photonics Devices and Materials,Anhui Institute of Optics and Fine Mechanics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China;Advanced Laser Technology Laboratory of Anhui Province,Hefei 230031,China)
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2024年第5期369-374,共6页
Acta Physica Sinica
基金
国家重点研发计划(批准号:2022YFB3605700)
先进激光技术安徽省实验室主任基金(批准号:AHL 20220ZR04)资助的课题.
