Tm^(3+)和Ho^(3+)双掺氟锗酸盐玻璃的中红外发光性质  

Mid-infrared Luminescence Properties of Tm^(3+) and Ho^(3+) Co-doped Fluorogermanate Glasses

作　　者：王勇超[1] 夏海平[1] 林琼斐[1] 章践立[1] 张勤远[2] 

机构地区：[1]宁波大学光电子功能材料重点实验室,浙江宁波315211 [2]华南理工大学光通信材料研究所特种功能材料教育部重点实验室,广州510640

出　　处：《光子学报》2010年第2期289-295,共7页Acta Photonica Sinica

基　　金：国家自然科学基金(60777030);宁波市重点实验室开放基金(2007A22010);宁波市4321人才基金;宁波大学王宽诚幸福基金资助

摘　　要：用高温熔融法制备了Tm3+和Ho3+离子双掺的65GeO2-12AlF3-10BaF2-8Li2O-5La2O3氟锗酸盐玻璃.应用Judd-Ofelt理论,获得了Ho3+离子的强度参量(Ω2,Ω4,Ω6),自发辐射跃迁几率Ar,辐射寿命τ等光谱参量.根据McCumber理论,计算了玻璃中Tm3+和Ho3+离子的吸收截面σa、受激发射截面σe和增益光谱G(λ).在808nm激光二极管激发下,研究分析了Tm3+离子的交叉弛豫过程和Tm3+敏化Ho3+离子的2.0μm的红外发射光谱.结果表明,一定浓度Ho3+的共掺提高了Tm3+(3F4)→Ho3+(5I7)之间的能量转移效率,增强了~2.0μm的红外发光.Fluorogermanate glasses with the compositions of 65GeO2-12A1F3-10BaF2-8Li2O-5LA2O3 codoped with Tm3＋ and Ho3＋ ions are fabricated by conventional melting method. According to the Judd-Ofelt theory, the J-O probabilities, fl strength uorescenc parameters （Ω2,Ω4,Ω6 ） of Ho3＋ are calculated, by which the radiative transition e branching ratios and radiative lifetimes are obtained. According to McCumber theory,the absorption and emission cross-sections corresponding to the 3H6→3F4 transition of Tm3＋ and the sI8→5I7 transition of Ho3＋ （at 2. 0 μm） are obtained, and respective gain cross section spectra are computed as a function of population inversion. With 808 nm LD excitation,the cross-relaxation process of Tm3＋ and infrared emission spectra of Tm3＋ sensitized Ho3＋ ions are studied. The results indicate that the energy transfer efficiency of Tm3＋ （3F4）→ Ho3＋ （517）ions is enhanced and the infrared fluorescence intensity at -2.0 μm is increased as the Ho3＋ co-doped into glass.

关 键 词：Tm3+和Ho3+双掺 锗酸盐氟氧化物玻璃 红外发射光谱 能量转移 

分 类 号：TQ171[化学工程—玻璃工业]