YAG晶体中Ce^3＋对Er^3＋的敏化作用

通过求解（Ｃｅ，Ｅｒ）：ＹＡＧ和Ｅｒ：ＹＡＧ的能级跃迁速率方程，讨论了Ｃｅ＾３＋对Ｅｒ＾３＋离子的敏化作用。表明掺Ｃｅ＾３＋可增强Ｅｒ＾３＋离子１．６６μｍ波长的激光强度，但仅改变了１．６６μｍ波长激光粒子数反转，即Ｎ２（＾４Ｉ１２／２）〉Ｎ１（＾４Ｉ１５／２）与Ｅｒ＾３＋离子浓度的关系。     

Er^3＋：YAG晶体Er^3＋离子的浓度对电磁感应光透明的影响

在一个三能级模型中展示了Er^3 :YAG晶体中的Er^3 浓度对电磁感应光透明（EIT）的影响。没有耦合场时,Er^3 离子浓度在15％左右时吸收达到最大;存在共振耦合场时,Er^3 离子浓度在3％左右时透射有一个最优值。     

Influences of Mg^2＋ ion on dopant occupancy and upconversion luminescence of Ho^3＋ ion in LiNbO3 crystal

The effects of a Mg^2＋ ion on the dopant occupancy and upconversion luminescence of a Ho^3＋ ion in LiNbO3 crystal are reported. The birefringence gradient of the crystal is measured to investigate the optical homogeneity. The X-ray powder diffraction spectrum and the upconversion luminescence are used to investigate defect structure and spectroscopic properties of Mg,Ho：LiNbO3. Under 808-nm excitation, blue, red, and very intense yellow-green bands are observed. Based on the energy levels of Ho^3＋ in LiNbO3, and the pump intensity dependence of the observed emission, an excitation scheme is presented. The upconversion emission spectra reveal an enhancement of upconversion intensity when the Mg^2＋ ions are introduced into Ho：LiNbO3. The main upconversion mechanism is discussed in this work.     

Sensitizing effect of Nd3＋ on the Er3＋： 2.7 μm-emission in fluorophosphate glass

Nd3+ strengthens the Er3+:2.7-μm emission 104 times in fluorophosphate glass;in addition,it can also decrease its upconversion effects and the 1.5-μm emission accordingly.Cross-relaxation process is the principal transition mechanism in this codoping system.Compared with Er3+ singly doped glass,JO parameters along with the Arad,β,τR values of Er3+ change markedly in Er3+:Nd3+ codoped glass because Nd3+ greatly in?uences the local environment around Er3+.Results also show that Nd3+ has a good 4I13/2 lifetime quenching effect as well as thermal load reduction ability for Er3+:2.7-μm emission.     

Er~(3+)和Yb~(3+)/Er~(3+)掺杂对石英光纤中倍频的影响

实验研究了掺Er~(3+)和Yb~(3+)/Er~(3+)石英光纤中的倍频过程.测量了不同Er~(3+)和Yb~(3+)/Er~(3+)掺杂量的光纤倍频转换效率和光纤倍频预处理前后Er~(3+)发射可见荧光的强度,探讨了Er~(3+)和Yb~(3+)掺杂对光纤中倍频过程的影响.     

Er~(3+)-Yb~(3+) codoped borosilicate glass for optical thermometry

Infrared to green up-conversion emissions centered at the wavelengths of about 524 and 550 nm of the Er3+-Yb3+ codoped borosilicate glass are recorded,using a 978 nm semiconductor laser diode(LD) as an excitation source.The fluorescence intensity ratio(FIR) of the green up-conversion emissions at about 524 and 550 nm in the Er3+-Yb3+ codoped borosilicate glass has been studied as a function of temperature over the temperature range of 295-873 K.The maximum sensitivity and the temperature resolution derived ...     

Er~(3+)/Ce~(3+)共掺TeO_2-Bi_2O_3-TiO_2玻璃的热稳定性和光谱特性研究

用高温熔融法制备了Er3+/Ce3+共掺新型碲酸盐玻璃(TeO2-Bi2O3-TiO2).采用差热分析方法研究了玻璃的热稳定性,测试并分析了不同Ce3+离子掺杂浓度下Er3+离子的吸收光谱、上转换光谱和荧光光谱特性.研究结果表明,制备的碲酸盐玻璃具有很好的热稳定性,玻璃析晶温度Tx与玻璃转变温度Tg之差(ΔT=Tx-Tg)达到了185℃,高于其它文献的报道;同时,Ce3+离子共掺引入的能量转移(Ce3+∶2F5/2+Er3+∶4I11/2→Ce3+∶2F7/2+Er3+∶4I13/2)有效地抑制了Er3+离子上转换发光并显著增强了1.53μm波段荧光强度,而发射截面随着Ce3+离子掺杂浓度相应增大.优异的热稳定性以及光谱性能揭示Er3+/Ce3+共掺碲酸盐玻璃是一种潜在的制备宽带掺铒光纤放大器的理想增益介质.     

Influence of Yb~(3+) concentration on the upconversion luminescence of oxyfluoride material doped with Er~(3+)

In this paper,a new upconversion luminescent material co-doped with Erbium and Ytterbium is reported. The upconversion luminescence transition routes and related properties are studied. The results show that the absorption and emission intensities under excitation of 980 nm laser increase with the increase of the Yb3+ concentration. The red emission is stronger than the green emission. The energy transfer process plays an important role in the upconversion mechanism.     

Up-conversion emissions of Er~(3+)-Yb~(3+) codoped Al_2O_3 nanoparticles by the arc discharge synthesis method

The Er3+-Yb3+ codoped Al2O3 nanoparticles with an average particle size of about 50 nm have been synthesized by an arc discharge synthesis method. The green and red up-conversion emissions centered at about 526, 547 and 677 nm, corresponding respectively to the 2H11/2→4I15/2, 4S3/2→4I15/2 and 4 F9/2→4I15/2 transitions of Er3+, were detected by a 978-nm semiconductor laser diode excitation. The Annealing has evident effect on the up-conversion emissions of the samples: The red up-conversion emission is notic...     

掺Er^3＋石英光纤中的共振增强受激四光子混频

首次实验观察到在1064nm激光泵浦下掺Er~(3+)石英光纤中的共振增强受激四光子混频现象和光学自由感应衰减过程.在频域和时域上实验证明了Er~(3+)的~4I_(11/2)激发态能级对受激四光子混频产生的反斯托克斯谱线的增强效应.     

Role of incoherent pumping and Er3+ ion concentration on subluminal and superluminal light propagation in Er3+-doped YAG crystal

We study the absorption-dispersion process and group index of weak probe field in a four-level Er3+:YAG crystal.We find that the Er3+ion concentration and incoherent pumping field can influence the absorption-dispersion process and group index of weak probe field.Moreover,our results show that Er3+ion concentration plays a major role in lasing without inversion and absorption with inversion.     

Up-conversion luminescence properties and energy transfer of Er~(3+)/Yb~(3+)co-doped oxyfluoride glass ceramic containing CaF_2 nano-crystals

The Er3+/Yb3+co-doped transparent oxyfluoride glass-ceramics containing CaF2nano-crystals were successfully prepared. After heat treatments, transmission electron microscopy(TEM) images showed that CaF2nano-crystals of 20–30 nm in diameter precipitated uniformly in the glass matrix. Comparing with the host glass, high efficiency upconversion luminescence of Er3+at 540 nm and 658 nm was observed in the glass ceramics under the excitation of 980 nm. Moreover,the size of the precipitated nano-crystals can be controlled by heat-treatment temperature and time. With the increase of the nano-crystal size, the intensity of the red emission increased more rapidly than that of the green emission. The energy transfer process of Er3+and Yb3+was convinced and the possible mechanism of Er3+up-conversion was discussed.     

Cd_3Al_2Si_3O_(12)玻璃中的Er~(3+)的光学跃迁

徐 迈　中国科学院长春光学精密机械与物理研究所,吉林长春１３００２１摘要：根据Ｊｕｄｄ－Ｏｆｅｌｔ理论,利用镉铝硅酸盐玻璃中Ｅｒ３＋的吸收光谱,计算了实验与理论振子强度,用最小二乘法拟合实验与理论振子强度得到了三个Ｊ－Ｏ强度参数ａ２,ｏ４,ａ６。并由此计算了ＥＪ”在不同能级之间的自发辐射系数Ａ、辐射寿命ｒ、荧光分支比β以及积分发射截面Σ。根据这些参数分析认为掺饵镉铝硅酸盐玻璃可能实现近红外激光输出。