双光束Raman组束研究

着重研究了双光束拉曼组束改善准分子激光光束质量。通过理论计算得出，在畸变泵浦光作用下可以获得近衍射极限Ｓｔｏｋｅｓ光的放大。并在稳态和瞬态激光脉冲的条件下，讨论了Ｒａｍａｎ工作介质的选择。在此基础上进行了氯化氙准分子激光在氢气中的双光束Ｒａｍａｎ组束实验研究，近衍射极限Ｓｔｏｋｅｓ光在获得功率放大的同时，其远场分布保持不变。激光聚焦亮度提高约３０００倍。最后讨论了放大自发辐射的抑制。     

超薄型金属氧化物／搪瓷复合辐射涂层蓄电池加热装置

为了解决战斗车辆在冬季使用中由于气温太低而造成蓄电池输出容量下降和充电困难问题,我们研制了一种超薄型红外线加温装置。该装置采用金属氧化物搪瓷复合涂料作为辐射层,具有发射率高、电一热转换效率高、抗腐蚀、不易脱落等特点。该加热装置体积小,重量轻,坚固实用,经3个冬季实车试验,效果令人满意。     

平面波导光传感器的研究进展

高灵敏度的光传感技术在工业过程控制、环境监测、食品安全、国家安全等领域具有重要的应用.随着平面光集成制备技术的发展,光传感器件也从研究开发光纤传感器拓展到便于集成的平面波导光传感器,特别是采用多孔、易掺杂的溶胶一凝胶材料作为化学、生物医学探测的光传感媒介.综述了平而波导光传感器的研究现状与发展趋势,讨论了器件的光传感原理与结构,介绍了其在化学、生物医学、环境检测等方面的虚用.     

电磁辐射对移动通信系统影响的研究

本文从电磁辐射对人体影响的角度分析了移动通信系统的传输特性,论证了在电磁辐射约束的条件下.单用户的上行链路相对于单用户的下行链路更容易达到传输能力饱和.随着上下行链路传输能力的增长.系统将会越来越表现出单用户的上行容量受限,而单用户的下行链路却拥有更大的传输速率余量和更大的发射功率余量,单用户的上下行链路具有显著的非对称传输特性,并在此基础上探讨了提高上行链路传输容量的方法.     

2D DOA estimation for noncircular sources using L-shaped sparse array

We present an algorithm for two-dimensional (2D) direction-of-arrival (DOA) estimation of noncircular sources using an L-shaped sparse array. An L-shaped sparse array consisting of two co-prime arrays is firstly introduced. Then, the fourth-order-cumulants (FOCs) of received data are used to construct a FOC matrix (FOCM), by which we can get the estimations of elevation angles. With the estimated elevation angles, the azimuth angles can be estimated by a low-complexity signal separation algorithm. During the procedure used for estimating azimuth angles, no any eigenvalue decomposition (EVD), peak search and pair-matching procedure need to be implemented. Although the aperture is extended significantly, the computation complexity of proposed algorithm still is acceptable. Compared with some analogous algorithms, our approach shows more attractive estimation performance. A lot of simulation results prove the advantages of proposed DOA estimation technology.     

Ionic Modulation of Interfacial Magnetism in Light Metal/Ferromagnetic Insulator Layered Nanostructures

Ferromagnetic insulator thin film nanostructures are becoming the key component of the state‐of‐the‐art spintronic devices, for instance, yttrium iron garnet (YIG) with low damping, high Curie temperature, and high resistivity is explored into many spin–orbit interactions related spintronic devices. Voltage modulation of YIG, with great practical/theoretical significance, thus can be widely applied in various YIG‐based spintronics effects. Nevertheless, to manipulate ferromagnetism of YIG through electric field (E‐field), instead of current, in an energy efficient manner is essentially challenging. Here, a YIG/Cu/Pt layered nanostructure with a weak spin–orbit coupling interaction is fabricated, and then the interfacial magnetism of the Cu and YIG is modified via ionic liquid gating method significantly. A record‐high E‐field‐induced ferromagnetic resonance field shift of 1400 Oe is achieved in YIG (17 nm)/Cu (5 nm)/Pt (3 nm)/ionic liquid/Au capacitor layered nanostructures with a small voltage bias of 4.5 V. The giant magnetoelectric tunability comes from voltage‐induced extra ferromagnetic ordering in Cu layer, confirmed by the first‐principle calculation. This E‐field modulation of interfacial magnetism between light metal and magnetic isolator may open a door toward compact, high‐performance, and energy‐efficient spintronic devices.     

330GHz砷化镓单片集成分谐波混频器

在太赫兹频段,二极管尺寸与波长相比已不能忽略,二极管的封装会引入很大的寄生参量,因此需建立二极管三维模型提取寄生参数.同时人工装配难度增大,会增加电路不确定性.采用12μm砷化镓单片集成悬置微带线结构,基于电子科技大学与中国电子科技集团第十三研究所自主联合设计的肖特基二极管研制330 GHz砷化镓单片集成分谐波混频器.实测结果显示在5 mW本振功率的驱动下,在328 GHz可得到最小变频损耗10.4 dB,在320~340 GHz范围内,单边带变频损耗小于14.7 dB.     

155Mbits/s大气传输光通信系统及其测试

研制了通信速率达 155Mbits/ s的大气传输光通信系统 ,传输距离为 2 km,采用光纤输入、光纤输出方式。介绍了该系统的设计考虑、基本原理、系统组成等 ,总结了长期外场实验的结果 ,该系统具有一定的实用价值与市场潜力。     

驱动复杂RLC互连树的逻辑门延时

提出了一个用于估计RL C互连树驱动点导纳的闭端等效π模型,并将其用于驱动复杂RL C互连树的逻辑门延时的估计中.与其他方法相比,它具有结构简单、精度较高的特点