罗丹明6G掺杂PDLC的光电特性

将罗丹明6G(Rh6G)溶入到PDLC中,制备出一种可激发荧光的荧光-聚合物分散液晶薄膜。分别对普通PDLC和荧光-PDLC透射谱在可见光范围内进行了测试,与普通PDLC相比,荧光-PDLC透射谱在535nm附近存在1个吸收峰,并且透射光强在550～580nm波段急剧增大。实验给出了罗丹明6G溶液的吸收谱和发射谱,从而证实了掺入的罗丹明6G分子是导致上述差异的原因。为了进一步研究荧光-PDLC的光电特性,在λ=532nm绿激光照射下,对荧光-PDLC薄膜透射光随角度-电压的变化进行了测试。结果表明,透过的绿光与激发的荧光随角度的变化呈现不同电压调制规律。散射角在0°～4°范围内,绿光光强随电压的增加而增加;散射角在5°～26°之间,绿光光强随电压的增大先增大后减小;当散射角大于27°时,绿光光强随电压增加一直减小;然而荧光光强随电压的增加一直减小,且服从高斯分布。     

用Nd∶YAG激光器泵浦Rh6G染料溶液的实验研究

报道了用 Nd∶ YAG倍频绿光 ( 532 nm)激光器泵浦 Rh6G染料溶液的实验过程。得到了最高 7%的光 -光转换效率。给出了 532 nm绿光泵浦不同浓度 Rh6G溶液所得到的染料激光峰值波长。同时分析比较了 Nd∶ YAG绿光激光及其泵浦的染料激光器输出激光光束的空间和时间特性。     

R6G—MPMMA型固体染料激光器的研制

利用激光染料罗丹明6G（R6G）掺杂的改性聚甲基丙烯酸甲酯（MPMMA），研究了R6G反杂MPMMA的吸收光谱，激光发及发射光谱，在调QNd:YAG倍频激光532nm泵浦下，得到590nm波长附近的激光输出，斜效率为21，并对漂白，寿命等进行了讨论。     

若丹明6G乙醇溶液中566nm泵浦的高效可调谐激光输出

报道了使用 5 66nm波长的染料激光激发高浓度的若丹明 6G(R6G)乙醇溶液得到波长在 5 72nm -610nm的可调谐染料激光输出 ,光束发散角为 5mrad ,能量转换效率达到 10 %。比较了使用Nd :YAG激光倍频光 ( 5 3 2nm)与 5 66nm染料激光激励R6G乙醇溶液的不同结果。讨论了染料激光浓度调谐机理 ,并从染料溶液的吸收谱及激发谱讨论了染料溶液抽运光波长的选择。     

GdCOB:Er3+,Yb3+晶体的光谱分析

生长了新型激光晶体 Gd Ca4 O( BO3) 3:Er3 ,Yb3 (简称 Gd COB:Er3 ,Yb3 ) ,并测量了其室温透过谱、荧光谱及红外吸收谱。在 974nm的二极管泵浦下 ,观察到微弱的绿光发射 ,在 1 536nm左右的荧光发射较强。讨论了 Gd COB:Er3 ,Yb3 晶体中 Yb3 → Er3 的能量传递 ,解释了绿光发射 ,提出 Yb3 合作向 Er3 进行能量传递的机制。     

聚乙二醇添加剂增强Rh6G水溶液激光的研究

选择适当的聚乙二醇添加剂量的Rh6G—水—聚乙二醇溶液,测量其激光输出、激光阈值和调谐光谱等参数,研究聚乙二醇对Rh6G—水溶液的激光增强特性.定性分析溶液的粘滞性对Rh6G发射荧光和激光的贡献.     

温度对强激光泵浦下激光染料荧光性能的影响

对三种在染料激光器中常用的激光染料(若丹明6G、硫化若丹明B、若丹明101)的乙醇溶液在强激光泵浦下的荧光性能进行了实验研究.测量了荧光强度在不同溶液浓度、不同温度下的变化规律.发现了温度对染料的最佳浓度值有一定影响:随着温度的降低,硫化若丹明B和若丹明101的最佳浓度值减小,而若丹明6G的最佳浓度值不随溶液温度变化.     

不同泵浦方式下Er3 /Yb3 共掺光纤放大器的自发辐射谱

用改进的MCVD法和湿法掺杂技术设计制作了2种不同Er^3＋、Yb^3＋浓度比的Er^3＋／Yb^3＋共掺光纤（EYDF），利用980nm和1480nm泵浦LD对Er^3＋／Yb^3＋共掺光纤放大器（EYDFA）的放大自发辐射（ASE）谱进行了研究。利用980nm LD泵浦时，这2种光纤在C波段的ASE强度都很弱，吸收系数小的EYDF在C波段的荧光强度比吸收系数大的光纤大2个量级。用1480nmLD对吸收系数大的EYDF进行泵浦，优化光纤长度，此时C波段荧光强度比用980nm泵浦时大5个量级。这是由于对于EYDF在976nm附近Yb^3＋有很强的非饱和吸收，导致能量传输效率差，因此980nmLD不适合做高浓度EYDFA的泵浦源。而1480nm泵浦时，Yb^3＋不再作为敏化剂而只起到克服成对Er^3＋间的浓度淬灭问题，同时起到提高Er^3＋在石英基光纤中的溶解度的作用。     

小型准分子激光泵浦染料激光

本文报道一种染料激光，它的泵浦阈值比用氮激光泵浦的染科激光低几十倍，调谐范围大于300A，且光束质量好。该染料激光是采用Rh6G和Coumarine120，并用我们新研制成的轴向放电激励小型XeCl准分子激光泵浦的。文中还对该纵向XeCl准分子激光的某些性能作了介绍。     

基于可见光通信技术的6G海洋水下通信方案

为了实现空天地海一体化通信的6G愿景,可以使用蓝绿激光进行水下通信。根据与潜航器通信的不同方式,将基于VLC（可见光通信）的6G海洋水下通信方案分为以下三种：岸边6G基站+无人机;卫星直联;卫星+船载6G基站。文章详细说明各方案的工作原理和流程,并对比不同方案在适用海域、现场部署速度、成本这三个方面的优劣。     

在银胶体系中罗丹明B单分子水平上拉曼光谱研究

采用表面增强托曼散射（SERS）技术,比较了单分子水平上银胶纳米体系中罗丹明B（RhB）浓度为10^-11mol／L以下的拉曼光谱和通常单分子水平上罗丹明6G（Rh6G）浓度在10^-11mol／L的拉曼光谱,无论自由沉积在玻璃表面还是在液体环境下的结果显示,单分子水平上Rh B的拉曼光谱灵敏度是Rh 6G的2倍多。因此,利用RhB作为探测试剂将能够提供更加丰富的信息,这对单分子的光谱研究以及高灵敏度探测试剂的应用研究具有重要的意义。     

Artificial Intelligence-Empowered Resource Management for Future Wireless Communications: A Survey

How to explore and exploit the full potential of artificial intelligence(AI)technologies in future wireless communications such as beyond 5G(B5G)and 6G is an extremely hot inter-disciplinary research topic around the world.On the one hand,AI empowers intelligent resource management for wireless communications through powerful learning and automatic adaptation capabilities.On the other hand,embracing AI in wireless communication resource management calls for new network architecture and system models as well as standardized interfaces/protocols/data formats to facilitate the large-scale deployment of AI in future B5G/6G networks.This paper reviews the state-of-art AI-empowered resource management from the framework perspective down to the methodology perspective,not only considering the radio resource(e.g.,spectrum)management but also other types of resources such as computing and caching.We also discuss the challenges and opportunities for AI-based resource management to widely deploy AI in future wireless communication networks.     

横向抽运染料激光振荡器效率分析

染料激光器由于不同的抽运方式,在出光效率和最佳输出耦合率等参数上有很大的不同.根据速率方程理论,分析了铜蒸气激光器(CVL)511 nm横向抽运染料罗丹明6G(Rh6G)激光振荡器的光-光转换效率问题.得出染料对激光的自吸收损耗效应是造成横向抽运和纵向抽运两种方式光-光转换效率与输出耦合率差异的主要原因.对不同的染料Rh6G浓度和不同的输出耦合镜反射率进行横向抽运实验,得到8.2%的最高光-光转换效率.实验结果显示横向抽运时较低的Rh6G浓度可以降低染料自吸收效应对出光效率的影响.同时,最佳输出耦合镜的反射率比纵向抽运时小.     

Optical properties of dyes with/without metal nanoparticles doped in a highly ordered nanostructure

Highly ordered nanocomposite arrays of Rh6G-Au-AAO are formed by filling anodized aluminum oxide (AAO) with Rhodamine 6G (Rh6G) and gold nanoparticles. The optical properties of Rh6G-Au-AAO are studied by visible absorptive and fluorescent spectroscopy. Compared with the fluorescence spectra of Rh6G-Au in the solution environment, the fluorescence peak intensities of Rh6G-Au-AAO are significantly enhanced, the maximum enhancement rate is 5.5, and a constant blue shift of ∼12 nm of peak positions is presented. The effects come from the spatial confinement of AAO and the inhibition of the fluorescence quenching effect induced by gold nanoparticles. The results show that the nanocomposite structures of fluorescence molecules-metal nanoparticles-AAO have a considerable potential in engineering molecular assemblies and creating functional materials of superior properties for future nanophotonics.     

PbS/并五苯场效应晶体管红外光电探测器

合成了尺寸均匀、分散性好,且吸收峰在近红外光谱区的硫化铅(PbS)量子点(QDs),并将其作为红外光吸收源与易于成膜且电学性能优良的有机化合物并五苯(Pentacene)相结合,形成量子点/并五苯复合薄膜作为有源层,采用顶栅底接触型水平场效应晶体管(FET)结构制备了红外光电探测器Au(S,D)/PbS QDs/Pentacene/PMMA/Al(G)。测试了暗态和980 nm波长激光照射下器件的电学参数和探测参数;探究了器件中载流子的传输机制;得到了电学和探测性能优良的PbS量子点/并五苯复合薄膜FET红外光电探测器,在辐照度为0.1 mW/cm2的红外激光照射下,器件的响应度达到49.4 mA/W,对应探测率为1.7×1011 Jones。     

Intent-based networks for 6G: Insights and challenges

Intent-Based Networks (IBNs), which are originally proposed to introduce Artificial Intelligence (AI) into the sixth-generation (6G) wireless networks, can effectively solve the challenges of traditional networks in terms of efficiency, flexibility, and security. IBNs are mainly used to transform users’ business intent into network configuration, operation, and maintenance strategies, which are prominent for designing the AI-enabled 6G networks. In particular, in order to meet the massive, intelligent service demands and overcome the time-varying radio propagation, IBNs can continuously learn and adapt to the time-varying network environment based on the massive collected network data in real-time. From the aspects of both the core network and radio access network, this article comprehensively surveys the architectures and key techniques of IBNs for 6G. In particular, the demonstration platforms of IBNs, such as the Apstra Operating System, Forward Networks Verification Platform, and One Convergence Service Interaction Platform, are presented. Moreover, the industrial development of IBNs is elaborated, including the emerging new products and startups to solve the problems of open data platforms, automated network operations, and preemptive network fault diagnosis. Finally, several open issues and challenges are identified as well to spur future researches.     

胆甾型液晶溶液膜中的随机激光

研究了激光染料若丹明6G(R6G)在乙基氰乙基纤维素[(E-CE)C]/丙烯酸(AA)胆甾型液晶溶液中的随机激光行为.发现在没有添加任何固体散射粒子的情况下,在(E.CE)C/AA/R6G溶液中观察到多个分离激光峰,最小半峰全宽(FWHM)为0.3 nm,表现出相干反馈行为.这种相干反馈激光行为的形成可能与液晶溶液中胆甾型微区的选择性反射和其折光指数各向异性密切相关.