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用高温熔融法制备了相同质量百分比浓度4%Tm2O3掺杂浓度下(90-x)GeO2-xNb2O5-10Na2O(其中数字为摩尔百分比x=1,2,4,6,8)以及Tm2O3掺杂浓度分别为质量百分比1%,2%,3%,4%下86GeO2-4Nb2O5-10Na2O(其中数字为摩尔分数)系列玻璃.研究了Nb2O5组分对玻璃热稳定性,荧光强度和J-O参数的影响.应用Judd-Ofelt理论,计算了Tm3+离子在Nb2O5浓度不同时的J-O强度参数(Ω2,Ω4,Ω6)及Tm3+离子各激发态能级的自发跃迁概率、荧光分支比以及辐射寿命等光谱参量.根据McCumber理论,计算了Tm3+离子能级3F4→3H6(1.8 μm)跃迁的吸收截面和受激发射截面.从获得的吸收截面、发射截面与离子掺杂浓度计算了1.8 μm荧光波段的增益截面曲线.在808 nm波长光的激发下,研究了Tm3+掺杂玻璃在1.47与1.8 μm附近的荧光特性.发现当Tm2O3掺杂浓度为质量百分比3%时,在1.8 μm处的荧光强度达最大,然后随着掺杂浓度的增大,其荧光强度反而降低;当Nb2O5摩尔分数含量大约在2%时,Tm3+在1.8 μm处的荧光强度最强.并讨论了Nb2O5组分变化对玻璃结构与光谱特性的影响情况.
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关键词:
- Tm3+掺杂锗铌酸盐玻璃 /
- 红外光谱性质 /
- 交叉弛豫 /
- Nb2O5
Glasses with the compositions of (90-x)GeO2-xNb2O5-10Na2O(x=1,2,4,6,8 molar ratio)doped with Tm2O3 at the same concentration (4wt%) and 86GeO2-4Nb2O5-10Na2O dore at different concentrations were fabricated respectively by conventional melting method.The effects of Nb2O5 content on glass stability,fluorescence strength and J-O strength parameters were studied.According to the Judd-Ofelt theory,the J-O strength parameters (Ω2, Ω4, Ω6) of Tm3+ in different Nb2O5 concentration were calculated,with which the radiative transition probabilities,branching ratios and radiative lifetime were obtained.Meanwhile,according to the McCumber theory,the absorption and emission cross-sections corresponding to the 3F4→3H6 transitions of Tm3+ at 1.8 μm were obtained.The gain cross section was calculated by using the emission cross-section,absorbtion cross section and Tm3+ concentration.The fluorescence features (under 808 nm LD excitation) at ～1.47 and ～1.8 μm of Tm3+-doped glasses of different concentrations were studied.The fluorescence intensity at ～1.8 μm reached to the maximum when the Tm2O3-doping concentration was about 3wt%,and then decreased as the doping concentration increased further.The fluorescence intensity at ～1.8 μm reached to the maximum when the Nb2O5 content in glass composition was about 2 mol%.The effects of Nb2O5 content on the glass structure and the spectra properties were also discussed.-
Keywords:
- Tm3+-doped germanium-niobate glasses /
- infrared spectral properties /
- cross relaxation /
- Nb2O5
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[18] Lin Q F,Xia H P,Wang J H,Zhang Y P,Zhang Q Y 2008 Acta Phys.Sin 57 2554 (in Chinese) [林琼斐﹑ 夏海平﹑ 王金浩﹑ 张约品﹑ 张勤远 2008 物理学报 57 2554]
[19] Ronaldo C F,BulhoesL O S 1994 J.Electrochem.Soc.141 L 29
[20] Dai S X,Hu L L,Izumitani T,Jiang Z H 1999 J.Chin.Ceram.Soc. 27 48 (in Chinese) [戴世勋﹑ 胡丽丽﹑ 泉谷砌郎﹑ 姜中宏 1999 硅酸盐学报 27 48 ]
[21] Gan F X,Chen S Z,Huang G S1982 Acta Opt.Sin.2 252 (in Chinese) [干福熹、 陈世正、 黄国松 1982 光学学报 2 252]
[22] Jian L,W H,Sun Z R,Chandra S R,Delbert E D 2004 J.Non-Cryst.Solids 336 189
[23] Lee D Y, Jang J W, Kim D T 2001 Ceram.Internat.27 291
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[1] Balda R,Lacha L M,Fernandez J,Fernandez-Navarro J M 2005 Opt.Mater.27 1771
[2] Shi D M,Zhang Q Y,Yang G F,Jiang Z H 2007 J.Non-Cryst.Solids 353 1508
[3] Jayasankar C K,Devi A R 1996 Opt.Mater.6 185
[4] Tanabe S,Tamai K,Hirao,Soga N 1993 Phys.Rev. B47 2507
[5] Judd B R 1962 Phys.Rev.127 750
[6] Ofelt G S 1962 Chem.Phys.37 511
[7] Spector N,Reisfeld R,Boehm L 1977 Chem.Phys.Lett.49 49
[8] Reisfeld R,Eckstein Y 1973 SolidStateCommun.13 265
[9] Brian M W,Norman P B,Donald J R,Jiang S B 2006 J.Non-Cryst.Solids 352 5344
[10] Krupke W F 1966 Phys.Rev.145 325
[11] Li G P,Xu T F,Nie Q H,Shen X 2006 Chin.J.QuantumElectron23 31 (in Chinese) [李广坡﹑ 徐铁峰﹑ 聂秋华﹑ 沈 祥 2006 量子电子学报 23 31]
[12] McCumber D E 1964 Phys.Rev.134 A 299
[13] Zou X L,Izumitani T 1993 J.Non-Cryst.Solids 162 68
[14] Li M H,Hu H F,Qi C H 2001 Acta Opt.Sin.21 626 (in Chinese) [李毛和﹑胡和方﹑祁长鸿 2001 光学学报 21 626]
[15] Reisfeld R,Eckstein 1975 Chem. Phys. 63 4001
[16] Ma T F,Wang Z C 1994 Opt.Precision Engng.2 10 (in Chinese) [马天飞﹑王中才 1994 光学精密工程 2 10]
[17] Baia L,Iliescu T,Simon S,Kiefer W 2001 Mol.Struc.599 9
[18] Lin Q F,Xia H P,Wang J H,Zhang Y P,Zhang Q Y 2008 Acta Phys.Sin 57 2554 (in Chinese) [林琼斐﹑ 夏海平﹑ 王金浩﹑ 张约品﹑ 张勤远 2008 物理学报 57 2554]
[19] Ronaldo C F,BulhoesL O S 1994 J.Electrochem.Soc.141 L 29
[20] Dai S X,Hu L L,Izumitani T,Jiang Z H 1999 J.Chin.Ceram.Soc. 27 48 (in Chinese) [戴世勋﹑ 胡丽丽﹑ 泉谷砌郎﹑ 姜中宏 1999 硅酸盐学报 27 48 ]
[21] Gan F X,Chen S Z,Huang G S1982 Acta Opt.Sin.2 252 (in Chinese) [干福熹、 陈世正、 黄国松 1982 光学学报 2 252]
[22] Jian L,W H,Sun Z R,Chandra S R,Delbert E D 2004 J.Non-Cryst.Solids 336 189
[23] Lee D Y, Jang J W, Kim D T 2001 Ceram.Internat.27 291
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