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71.
本文研究了x GeO2-(70-x)TeO2-5K2O-5Na2O-10Nb2O5-10ZnO-0.2Er2O3(x=0,10,25,50,70(摩尔百分数))玻璃的物性和光谱特性,讨论GeO2含量对锗碲酸盐玻璃物性和光谱特性的影响.研究发现:GeO2的加入提高了碲酸盐玻璃热稳定性,并且使玻璃的最大声子能量略微增加;随GeO2的增加,掺Er3+锗碲酸盐玻璃的Judd-Ofelt强度参量Ω2和Ω6逐渐增大,但玻璃受激发射截面有减小的趋势;由McCumber理论,计算了掺铒锗碲酸盐玻璃在1.53μm处最大受激发射截面为9.92×10-21cm2,Er3+离子4I13//2→4I15/2发射谱的最大荧光半高宽为52nm,同时,实验发现,在977nm LD抽运下,掺铒锗碲酸盐玻璃存在较强的荧光上转换现象,随GeO2含量的增加,上转换荧光强度呈降低的趋势. 相似文献
72.
A series of highly Er3+/Yb3+ co-doped fluoroaluminate glasses have been investigated in order to develop a microchip laser at 1.54 μm under 980 nm excitation. Measurements of absorption, emission and upconversion spectra have been performed to examine the effect of Er3+/Yb3+ concentration quenching on spectroscopic properties. In the glasses with Er3+ concentrations below 10 mol%, concentration quenching is very low and the Er3+/Yb3+ co-doped fluoroaluminate glasses have stronger fluorescence of 1.54 μm due to the 4I13/2 → 4I15/2 transition than that of Er3+ singly-doped glasses. As Er3+ concentrations above 10 mol% in the Er3+/Yb3+ co-doped samples, concentration quenching of 1.54 μm does obviously occur as a result of the back energy transfer from Er3+ to Yb3+. To obtain the highest emission efficiency at 1.54 μm, the optimum doping-concentration ratio of Er3+/Yb3+ was found to be approximately 1:1 in mol fraction when the Er3+ concentration is less than 10 mol%. 相似文献
73.
Er^3+/Yb^3+ Codoped Phosphate Glass Fibre with Gain per Unit Length Greater Than 3.0 dB/cm 下载免费PDF全文
We experimentally study a novel fibre with high gain per unit length based on the homemade erbium-ytterbium codoped phosphate glass. The gain and noise characterizations with different pump powers at different wavelengths are investigated. The 1.8-cm-long fibre, dual-pumped by two single mode 980-nm fibre-pigtailed laser diodes, provides a gain per unit length greater than 3.0dB/cm and a noise figure less than 6.SdB. The gain saturation behaviour at 1535nm is obtained and the saturation output power (3 dB compression) is greater than 5 dBm. 相似文献
74.
Er3+/Yb3+共掺杂氧氟硅酸盐玻璃的上转换发光 总被引:8,自引:5,他引:3
研究了Er^3 /Yb^3 共掺氧氟硅酸盐玻璃的吸收光谱、上转换光谱和拉曼光谱。分析了氧氟硅酸盐玻璃中Yb”敏化Er^3 的上转换发光机理。结果表明:通过975nm的激光二极管激发,在室温下同时观察到蓝光(408nm)、绿光(529nm和545nm)和红光(667nm),分别是由于Er^3 离子。H9/2→^4I15/2,H11/2→^4I15/2,H3/2→^4I15/2和H9/2→^4I15/2跃迁。随Yb2O3浓度的增加。Yb^3 对Er^3 的能量转移增强,因此蓝光、绿光和红光的发光强度都增强,强烈的绿光和红光激发是由于双光子吸收过程,而微弱的蓝光是由于三光子吸收过程。拉曼光谱发现,对Er^3 离子在氧氟硅酸盐玻璃中的上转换发光。玻璃结构中的PbF2起到重要作用。 相似文献
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76.
The upconversion luminescence of Er^3+/Yb^3+ ions is researched in a novel transparent oxyfluoride borosil- icate glass and glass ceramics under 980-nm excitation. Fluoride nanocrystals Ba2YF7 are successfully precipitated in glass matrix, which is affirmed by the X-ray diffraction results. Compared with the parent glasses, significant enhancement of upconversion luminescence is observed in the Er^3+/Yb^3+ codoped transparent glass-ceramics, which may be due to the variation of coordination environment around Er^3+ and Yb^3+ ions after crystallization. The possible upconversion mechanism is also discussed. 相似文献
77.
报道了可紫外激光刻写的掺铒Na2O-Bi2O3-SiO2和Na2O-B2O3-Bi2O3-SiO2玻璃的光谱特性. 测量和计算了玻璃的光谱参数,分析、讨论了Bi2O3和B2O3含量变化对光谱参数的影响.实验表明基质玻璃中Bi2O3和B2O3含量改变可有效调节掺铒铋硅酸盐玻璃光谱参数.Bi2O3和B2O3含量增加,玻璃的光吸收和荧光性质改善,但Er3+离子的4I13/2能级寿命降低.在B2O3含量为40%(Bi2O3/SiO2=0.67)时,Er3+离子峰值发射截面、4I13/2能级的荧光寿命和荧光半高宽分别为8.49×10-21cm2,0.52ms和78nm.结果表明掺铒铋硅酸盐玻璃是有前途的紫外光敏有源玻璃材料之一. 相似文献
78.
研究了Er3+离子掺杂钡镓锗玻璃的吸收光谱、拉曼光谱和上转换光谱.分析了Er3+离子在钡镓锗玻璃中的上转换发光机理.结果表明:玻璃的最大声子能量为828cm-1,紫外截止波长为275nm.采用800nm和980nmLD激发玻璃样品,在室温下观察到强烈的上转换绿光和红光发射.随着Er3+离子浓度的增加,绿光发光强度先增加后减小,而红光发光强度呈单调递增趋势.能量分析表明:800nmLD激发产生的绿光主要源于Er3+离子4I13/2能级的激发态吸收过程;红光发射主要源于Er3+离子4I13/2能级与4I11/2能级之间的能量转移过程.980nmLD激发产生的绿光主要源于Er3+离子4I11/2能级之间的能量转移过程;而红光发射主要源于Er3+离子4I13/2能级与4I11/2能级之间的能量转移过程和4I13/2能级的激发态吸收过程.通过量子效率分析,发现采用800nmLD激发Er3+离子掺杂浓度为1mol% 的样品时,上转换绿光发光效率最高. 相似文献
79.
全光纤传感用磁光玻璃的研究进展 总被引:6,自引:1,他引:6
随着电力需求的不断增长,竞争日益剧烈的电力市场迫切需要高带宽、宽动态测量范围的小型传感器,全光纤传感器因其具有测量精度高、响应速度快、体积小和易安装等特点而引起了人们的广泛关注:在用于全光纤传感器的基质材料中,稀土离子掺杂的磁光玻璃因其各向均匀性好、磁光性能优异和成本低廉而成为首选材料之一,因而得到了广泛研究。基于目前磁光玻璃的研究成果,本文对有可能应用于全光纤传感器的高掺稀土玻璃材料进行了介绍,并对当前磁光玻璃研究中存在的问题进行了讨论。 相似文献
80.
新型掺铒铋酸盐玻璃上转换发光研究 总被引:2,自引:0,他引:2
制备了新型掺Er3 铋铅锶玻璃,研究了玻璃的吸收光谱和上转换光谱性质,应用Judd-Ofelt理论计算了铋铅锶玻璃的3个强度参量Ωt(t=2,4,6),分别为Ω2=3.27×10-20 cm2,Ω4=1.15×10-20cm2,Ω6=0.38×10-20 cm2.计算了Er3 离子的振子强度、自发辐射跃迁几率、荧光分支比和辐射寿命等光谱参数.研究了上转换发光强度随泵浦激光功率的变化,上转换荧光525,546和657 nm曲线的斜率分别为1.86,1.88和1.85,表明红、绿光发射均为双光子吸收过程. 相似文献