1,3-Cycloaddition of nitrones in ionic liquids catalyzed by Er(III): an easy access to isoxazolidines

1,3-Dipolar cycloadditions of nitrones with alkenes afforded the corresponding isoxazolidines in ionic liquids in the presence of Er(OTf)₃. The ionic liquid and the catalyst are recycled up to five times without any specific treatment or loss of activity. Extension of the procedure to the synthesis of isoxazolidinyl nucleosides has been investigated.     

Modulation of absorption and refractive index in Er3 -doped fibers

Modulation of the absorption and refractive index in Er³⁺-doped fibers for a signal wavelength in the 1550-nm band and a pump wavelength of 980 nm is investigated. The experimental results are compared with a model that takes into account optical transitions between the ground state and the metastable state in Er³⁺. Good agreement between the experiment and the model is obtained apart from a wavelength-independent constant in the refractive index modulation, which is discussed.     

ICP－AES法测定钨酸钇钾激光晶体中的Er和Nd

应用ＩＣＰ－ＡＥＳ法测定钨酸钇钾［ｋＹ（ＷＯ４）２］激光晶体中的Ｅｒ和Ｎｄ。试样用磷酸分解，Ｔｍ被选作内标元素。Ｅｒ和Ｎｄ的回收率分别为９８．６％－１０５．３％和９６．５％－１０５．８％，相对标准偏差分别为１．９０％和１．６０％。     

氟化铟基玻璃中Er^3＋离子光谱性质的研究

测定了掺Ｅｒ＾３＋氟化铟基玻璃的吸收光谱，激发光谱和荧光光谱，计算了该玻璃的强度参数Ω（ｔ＝２，４，６），给出了Ｅｒ＾３＋离子的发光特性的计算结果，并与掺Ｅｒ＾３＋的氟锆酸盐玻璃做比较，解释了基质玻璃对Ｅｒ＾３＋离子发光特性的影响。     

注入Si中的稀土离子Er3+的光学特性

用离子注入方法,将稀土离子Er3+注入到n-Si单晶中,通过对其低温(77K)光致发光光谱的测量,研究其光学特性.结果表明,注入剂量控制在1×1012cm-2～1×1015cm-2范围,退火温度控制在900℃～1100℃时,样品的主要发光峰值位于1.54μm左右.研究了样品的光致发光光谱随注入剂量、退火温度的变化关系,给出峰值在1.54μm附近的未分辨开的谱线的半宽为16.4meV.     

Er3+,Yb3+共掺磷酸盐玻璃沟道波导放大器

在自行研制的Er3 ，Yb3 共掺磷酸盐玻璃基质上用离子交换方法制作出沟导光波导放大器。在110mW的抽运功率下(抽运光波长为980nm)，在1．8cm长的器件上获得了3．8dB的小信号(信号光波长为1．55μm)增益，单位长度上的增益为2．1dB／cm。     

掺铒光纤吸收增加光学双稳态

报道了的掺铒光纤中观测到的吸收增加非线性和无腔光学双稳运转。双稳是低功率的（亚毫瓦级）。分析了掺铒光纤吸收增加双稳态产生的机理     

Laser spectroscopy of optical centers in borosilicophosphate glass, coactivated by erbium and ytterbium ions

Based on analysis of the laser emission spectra of borosilicophosphate glass, coactivated by Er³⁺ and Yb³⁺ ions, we have determined the structure of the Stark splitting of the luminescence band for the erbium ion in the 1.5 μm region (the transition ⁴I_13/2 → ⁴I_15/2). In the wavelength interval 1532–1547 nm, we identified 12 sets of lines belonging to different types of optical centers of predominantly cubic symmetry. __________ Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 73, No. 4, pp. 483–487, July–August, 2006.     

加注稀土元素铒改善轴承表面性能的研究

在Ｍｏ＾＋＋Ｎ＾＋注入模式的基础上，应用电子能谱、卢瑟福背散射谱、扫描电子显微镜和ＭＨＫ－５００型摩擦磨损试验机等研究了加注稀土元素铒正离子Ｅｒ＾＋对轴承表面摩擦学性能和耐蚀性能的影响。结果表明，在合理配置Ｍｏ＾＋、Ｎ＾＋、Ｅｒ＾＋之能量和剂量的情况下，加注Ｅｒ＾＋既能更好地改善轴承的表面性能，又能使重离子的强韧化效果提高２－４倍以上，表明ＭＯ＾＋＋Ｎ＾＋＋Ｅｒ＾＋注入模式是一种具有良好应用前景的     

1.54 μm Light emission from Er/O and Er/F doped Si p–i–n diodes grown by molecular beam epitaxy

Various light emitting devices (LED) have been processed using Er/O- and Er/F-doped Si layered structures grown by molecular beam epitaxy (MBE) at low temperature. A comparative study has been carried out in order to provide more understanding of the electroluminescence (EL) excitation and de-excitation mechanisms in particular at a high injection current regime. Comparing the experimental results with model calculations the values of excitation cross section, σ_ex, and effective Auger coefficient, C_A, have been determined for various devices operated at different biases. Time-resolved EL measurements of these Er/O- and Er/F-doped MBE Si structures, using an experimental set-up with a time response of 200 ns, have been performed with different excitation conditions. Besides the spontaneous Er emission (700 μs), some fast EL decay processes associated with the Auger energy transfer via free carriers (4 μs), and the hot carrier effects (200 ns) have been identified.