固体相干激光雷达系统的发展

本文介绍了固体相干激光雷达系统的发展，详细评述了Ｎｄ：ＹＡＧ激光器，Ｔｍ，Ｈｏ：ＹＡＧ激光器和（Ｃｒ）；Ｔｍ：ＹＡＧ激光器在相干激光雷达系统中的工作原理及应用前景。     

YAG激光的工作特性与医学应用的关系

本文列举了Ｎｄ：ＹＡＧ，ＨＯ：ＹＡＧ，Ｅｒ：ＹＡＧ，ＫＴＰ－Ｎｄ：ＹＡＧ激光器件的工作特性，根据其不同的激光波长分析了在医学领域应用的范围，对医用ＹＡＧ激光器提出了研究与改进的措施。     

高平均功率Nd：YAG激光器

本文分析了Ｎｄ：ＹＡＧ激光器的功率限制因素，讨论了高功率Ｎｄ：ＹＳＧ激光器的设计和激光输出特性，指出了高功率Ｎｄ：ＹＡＧ激光器的发展对激光晶体生长和加工的新要求。     

激光治疗结直肠息肉

1　治疗方法11　激光器及功率:临床用于消化道息肉治疗常有Ａｒ 激光器、ＹＡＧ激光器、ＣＯ2激光器等。Ａｒ 激光器因功率较小多用于小的或扁平息肉的切割或凝固治疗;输出功率多为10～30Ｗ。ＹＡＧ激光中临床最常用的为Ｎｄ:ＹＡＧ激光器。ＹＡＧ激光功率较大,止血效果优于Ａｒ 激光,常见于组织切割、凝固、汽化、碳化和止血等,功率常用30～80Ｗ。有人报道脉冲ＴＨＣ:ＹＡＧ激光效果及并发症方面优于Ｎｄ:ＹＡＧ激光〔3〕。ＣＯ2激光功率更大,多用于切割、碳化或汽化组织,过去因传输光纤未研制成功仅用于肛门和直肠下段息肉治疗。目前,国内…     

双掺Cr,Nd:YAG单片高效自调Q激光

掺四价格的钇铝石榴石晶体（Ｃｒ４＋：ＹＡＧ）具有优良的光化学和热稳定性,它既具有 １．３４－１．５８ μｍ范围的可调谐激光输出性能,又具有在０．９－１．２μｍ范围的显著饱和吸收特性．目前,人们用这种晶体作为Ｎｄ：ＹＡ Ｇ激光器理想的被动调Ｑ开关．更有意义的是双掺Ｃｒ,Ｎｄ：ＹＡＧ晶体,它既是增益介质,又是被动调Ｑ的饱和吸收体,可以实现被动调 Ｑ激光器的小型化．特别用 ＬＤ泵浦的全固化单片激光器,可以进一步实现调Ｑ激光器微型化和集成化． 我们用提拉法（Ｃｚ）沿（１１１）方向生长了双掺Ｃｒ４＋和Ｎｄ３＋的…     

Nd：YAG激光器在开发与生产液晶显示器中的应用

Ｎｄ：ＹＡＧ激光器在开发与生产液晶显示器中的应用Ｎｄ：ＹＡＧ激光器目前已广泛用于材料加工和打标。其趋势是，材料加工领域采用功率越来越大的系统，打标方面采用自动化计算机控制技术。除了这些传统领域外，电子工业还采用Ｎｄ：ＹＡＧ激光器进行实验和生产。这里除...     

二级管泵浦的Q开关Nd：YAG激光器及测距样机

研究了电光调Ｑ及Ｃｒ４＋：ＹＡＧ被动Ｑ开关的二极管泵浦Ｎｄ：ＹＡＧ激光器，获得了１１ｍＪ的电光调Ｑ及被动Ｑ开关激光脉冲，Ｑ开关效率分别为７５％和３２％。以Ｃｒ４＋：ＹＡＧ被动Ｑ开关的激光器为基础，研制了二极管泵浦的Ｎｄ：ＹＡＧ激光测距机样机。以＜３ｍＪ的激光脉冲，无发射天线压缩发射，采用等效口径为Φ２６ｍｍ的接收天线。在～３Ｋｍ的能见度下，实现了３３９Ｋｍ的测距。最大测程为４７Ｋｍ（５Ｋｍ能见度），整机工作频率为１６ｐｐｓ，自然传导冷却。     

采用Cr^4＋：YAG为可饱和呼吸体的Nd：YAG调Q锁模

在实验上,以Ｃｒ＾４＋：ＹＡＧ为可饱和吸收体,对Ｎｄ：ＹＡＧ激光实现调Ｑ锁模,得到平均脉宽为１９０ｐｓ的脉冲序列。利用动锁模的涨落理论,分析了Ｃｒ＾４＋：ＹＡＧ对Ｎｄ：ＹＡＧ激光调Ｑ锁模的动力学过程及各种影响因素,同时讨论了Ｎｄ：ＹＡＧ的克尔透镜效应在调Ｑ锁模过程中的作用,得到了与实验较为一致的结果。     

紫外Nd：YAG激光技术

紫外Ｎｄ：ＹＡＧ激光技术Ｎｄ：ＹＡＧ激光器以可靠、稳定和易于使用著称，近２０年来，它已确定了在汽车、医疗、航空和微电子产品方面的工业实用装置的地位。以长脉冲时间和１０６４ｎｍ基频输出而工作的Ｎｄ：ＹＡＧ激光器，可使材料产生热过载、熔化和蒸发，可用来进...     

（Nd,Er）：YAG晶体中Nd^3＋和Er^3＋离子间相互作用

用激光加热基座法生长了Ｅｒ：ＹＡＧ、（Ｎｄ、Ｅｒ）：ＹＡＧ和Ｎｄ：ＹＡＧ单晶光纤，测试了单晶光纤的透过率谱和Ｅｒ＾３＋离子＾４Ｉ１１／２、＾４Ｉ１３／２态，Ｎｄ＾２＋离子＾４Ｆ３／２态的固有寿命τ０，双掺晶体中这些态的平均寿命τ０。讨论了Ｎｄ＾３＋离子对Ｅｒ＾３＋离子的敏化作用。     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first     

JOURNAL OF ELECTRONICS(CHINA)

正~~     

NEXT GENERATION WIRELESS NETWORKS–ESPECIALLY THE USE OF MILLI-MICROWAVE BANDS

The global bandwidth shortage of wireless communications has motivated the exploration of the naillimeter wave （ram-wave） frequency spectrum for the next generation wireless communications. Recent advances in RF CMOS technology and high speed baseband signal processing technologies have enabled tile extensive research and development of turn-wave wireless communications. The multi gigabit per second data rate of ram-wave system will lead to applications in many important scenarios, such as WPAN, WLAN,back-haul for cellular system. And the frequency bands include 28 GHz, 38 GHz, 45GHz, 60GHz, E-BAND and even beyond 100 GHz. The propagation and the imitation of the RF circuits design in these frequency bands make the directional antennas be inevitable for mm-wave communications.