【摘 要】
：
ZnO films containing Er and Ge nanocrystals (nc-Ge) were synthesized and their photoluminescence (PL) properties were studied. Visible and near-infrared PL intensities are found to be greatly increased in nc-Ge-containing film. Er-related 1.54 μm emission
【机 构】
：
SchoolofInformationScienceandEngineering,ShandongUniversity,Jinan250100,China
【出 处】
：
PhotonicsResearch
论文部分内容阅读
ZnO films containing Er and Ge nanocrystals (nc-Ge) were synthesized and their photoluminescence (PL) properties were studied. Visible and near-infrared PL intensities are found to be greatly increased in nc-Ge-containing film. Er-related 1.54 μm emission has been investigated under several excitation conditions upon different kinds of Ge, Er codoped ZnO thin films. 1.54 μm PL enhancement accompanied by the appearance of nc-Ge implies a significant correlation between nc-Ge and PL emission of Er3 . The increased intensity of 1.54 μm in Ge:Er:ZnO film is considered to come from the joint effect of the local potential distortion around Er3 and the possible energy transfer from nc-Ge to Er3 .
其他文献
为进一步提高激光甲烷遥测仪的抗噪能力,在波长调制光谱技术“相干检测、低1/f噪声”的基础上,进一步利用小波去噪技术的“多尺度、多分辨分析”能力对气体吸收传感信号进行去噪处理。首先建立了一种甲烷遥测系统,通过仿真优化了小波去噪的相关参数,并分析了基于经验模态分解的小波去噪方法的效果;在采用和不采用小波去噪算法的情况下,开展了传感器性能的对比实验,以此验证该技术应用于遥测系统的可行性。利用积分浓度为200×10 -6 m的甲烷气体样品开展的甲烷检测实验结果表明,采用小波去噪算法提取二次谐波信号时,可将信噪比从
The enlargement of the emitting aperture is usually one of the important methods of increasing verticalcavity surface-emitting laser (VCSEL) optical output power. However, in a VCSEL with a larger aperture, the inhomogeneity in the injected current often
To meet application requirements of high resolution and high frame rate for the aerial camera, a real-time high definition (HD) aerial camera imaging system is designed and developed. A KAI-01050 charge-coupled device (CCD), ADSP-BF561, and AD9920A are us
硫系玻璃具有较宽的红外透过范围及极高的线性和非线性折射率。综述了基于受激布里渊散射效应的硫系玻璃光器件研究进展,以及硫系光纤和波导器件在布里渊激光器、慢光产生和微波光子滤波器等领域的应用现状,指出了研究中存在的问题,并展望了其发展前景。
Precision measurement tools are compulsory to reduce measurement errors or machining errors in the processes of calibration and manufacturing. The laser interferometer is one of the most important measurement tools invented in the 20th century. Today, it
提出了一种基于分布式光纤应变感测的测力方法,开展了基于布拉格光纤光栅技术(FBG)和布里渊散射光时域分析技术(BOTDA)的薄壁圆环加载实验,详细阐述了分布式光纤传感器的原理、数据拟合及误差分析等问题。为了更进一步验证所提方法的可行性,实验中对FBG和BOTDA所获结果进行了对比分析。实验结果表明,通过BOTDA数据计算的作用力更加接近于实际测量值,证明了分布式光纤监测技术满足土工实验数据采集的精
非线性晶体内红外激射光束的谐波增加是Lear-Siegler的光激射器系统中心的商用绿光激射器的基本机构。LS-12型装置采有装有Q幵关的掺钕玻璃光激射器；由二氢磷酸钾(KDP)倍增器产生的的二次谐波在5305埃处的谱线宽度是10埃。最大速率为每秒6次脉冲处的输出是100千瓦峰值。脉冲持续是0.1微秒。
本文从理论上计算了18种苯衍生物分子的偶极矩,同时预测了它们的晶体倍频性能的高低。合成了这些分子晶体,并测定了它们的倍频性能和分子偶极矩。结果表明,理论预测倍频性能的高低与实验测量值是吻合的,从而为作者提出的适用于同分异构有机晶体的“倍频效应——偶极矩”规律提供了又一论证;同时筛选出4种可能成为良好倍频材料的苯衍生物,其中3-MNA和3-BNA的倍频效应分别为ADP的7倍和2倍。