钕离子掺杂硅酸镓钙铌晶体的生长和激光性能研究  

Growth and Laser Properties of Neodymium Ion-doped Ca_(3)NbGa_(3)Si_(2)O_(14) Crystal

作　　者：张琮 夏聪 马世会 于永贵 胡章贵 叶宁 王继扬[2] 吴以成 Zhang Cong;Xia Cong;Ma Shihui;Yu Yonggui;Hu Zhanggui;Ye Ning;Wang Jiyang;Wu Yicheng(Institute of Functional Crystals,School of Materials Science and Engineering,Tianjin University of Technology,Tianjin 300384,China;State Key Laboratory of Crystal Materials,Shandong University,Jinan 250100,Shandong,China)

机构地区：[1]天津理工大学材料科学与工程学院功能晶体研究院,天津300384 [2]山东大学晶体材料国家重点实验室,山东济南250100

出　　处：《中国激光》2023年第22期55-62,共8页Chinese Journal of Lasers

基　　金：国家自然科学基金(52002272,92163207)。

摘　　要：Nd^(3+)离子由于其独特的能级结构,在近红外激光应用方面受到了广泛关注。硅酸镓钙铌(CNGS)晶体作为硅酸镓镧体系的一员,具有较好的力学性能和热学性能。使用提拉法生长了Nd^(3+)掺杂的CNGS晶体,直径为30 mm,等径部分长度为45 mm,并对其折射率、吸收光谱、发射光谱等光学性能进行了表征。使用880 nm泵浦光,沿b向获得了1065 nm的激光输出,泵浦功率为6.69 W时激光输出功率为1.88 W,转换效率为28.1%。Objective Nd^(3+) ions have received considerable attention for laser applications owing to their unique energy-level structures.Calcium niobium gallium silicate(CNGS)crystals,members of the gallium lanthanum silicate system,exhibit superior mechanical and thermal properties.In this study,Nd^(3+)-doped CNGS crystals with the diameter of 30 mm and isometric section length of 45 mm are grown using the pull-down method,and their optical properties,including refractive index,absorption spectra,and emission spectra,are characterized.The laser output of 1065 nm is obtained along the b-direction using 880 nm pumping,and the laser output power is 1.88 W with the conversion efficiency of 28.1%at the pumping power of 6.69 W.Methods Pure CNGS and neodymium-doped CNGS crystals with the diameter of 30 mm and isometric part length of 45 mm are prepared via the Czochralski method,using 99.99% high-purity(mass fraction)CaCO_(3),Nb_(2)O_(5),Ga_(2)O_(3),and SiO_(2) raw materials,as shown in Fig.1.Single-crystal X-ray diffraction(XRD)is performed using a diffractometer.The corresponding data are collected using a diffractometer,processed with the SHELEX software,and then all the atoms in the structure are refined using full matrix least square method.The grown CNGS and Nd∶CNGS crystal samples are processed into prisms along the c-direction and adapt for refractive-index measurements using a spectrometer at room temperature.The absorption spectra of crystals with size of 6 mm×6 mm×2 mm are recorded in the wavelength range of 400-950 nm along the a and b directions by an ultraviolet-visible-near-infrared(UV-Vis-NIR)spectrophotometer.The excitation spectra,fluorescence lifetimes,and photoluminescence spectra are determined using a fluorescence spectrum analyzer.Laser experiments are performed using a lens combination with numerical aperture(NA)of 0.22,laser spot radius of 200μm,and focal length of 7.5 cm.As shown in Fig.2,the input mirror is concave with curvature radius R=50 mm,the output mirror is calm,and the transmission rate

关 键 词：激光光学 晶体生长 提拉法 Ca_(3)NbGa_(3)Si_(2)O_(14) 钕离子 激光 

分 类 号：O782.5[理学—晶体学]