Now showing items 1-20 of 3941

    • > 1 MW peak power, an efficient Yb:YAG/Cr4+:YAG composite crystal passively Q-switched laser 

      Dong, Jun; Ren, Yingying; Cheng, Huihui; 董俊 (IOP PUBLISHING LTD, 2014 MAY)
      An efficient Yb:YAG/Cr4+:YAG composite crystal passively Q-switched laser with a peak power of over 1 MW has been developed under quasi-continuous-wave (QCW) laser-diode pumping. A maximum output energy of 19 mJ was obtained ...
    • 1-, 15-, and 2-μm fiber lasers Q-switched by a broadband few-layer MoS2 saturable absorber 

      Luo, Zhengqian; Huang, Yizhong; Zhong, Min; Li, Yingyue; Wu, Jianyu; Xu, Bin; Xu, Huiying; Cai, Zhiping; Peng, Jian; Weng, Jian; 罗正钱; 徐斌; 许惠英; 蔡志平; 翁建 (Institute of Electrical and Electronics Engineers Inc., 2014 Decem)
      We propose and demonstrate 1, 1.5, and 2 μm passively Q-switched fiber lasers by exploiting a few-layer Molybdenum sulfide (MoS2) polymer composite as broadband saturable absorber (SA), respectively. The few-layer MoS2 ...
    • 1.1μm波段Nd:YAG激光运转及其腔内倍频 

      贾富强; 薛庆华; 郑权 (光电子·激光, 2005-07)
      为了提高Nd:YAG/LBO腔内倍频黄光激光器输出功率的稳定性,通过在腔内插入FP标准具选择出单一激光谱线来实现,同时通过FP标准具的角度调谐还得到了1.1μm波段3条分离谱线的单独倍频运转。用2WLD抽运Nd:YAG,腔内加入150μm厚的熔石英FP标准具,先通过FP标准具放置角度的调节获得单一谱线的基频光运转,再通过LBO腔内倍频获得高稳定性的黄光输出,在1.6W的抽运功率下,556nm、558nm和561nm的输出功率分别为85m ...
    • 1.535μm Er:Yb磷酸盐玻璃薄片连续激光器 

      蔡志平 (1998-06-30)
      报道了以980nm钛宝石激光端面泵浦室温连续1.535μmEr:Yb磷酸盐玻璃薄片激光器。实验上研究了950-988nm泵浦波长范围内激光输出特性,结果表明,975nm为最佳泵浦波长。在975nm泵浦下,实现了5mW低阈值起振和21%的光-光转换效率;最大单频线偏振输出功率达22mW。同时,观察并分析了高泵浦条件下输出激光的偏振与纵模性质,以及由泵浦吸收饱和而引起的输出功率饱和效应。
    • 106 mu m Q-switched ytterbium-doped fiber laser using few-layer topological insulator Bi2Se3 as a saturable absorber 

      Luo, Zhengqian; Huang, Yizhong; Weng, Jian; Cheng, Huihui; Lin, Zhiqing; Xu, Bin; Cai, Zhiping; Xu, Huiying; 罗正钱; 翁建; 徐斌; 蔡志平; 许惠英 (OPTICAL SOC AMER, 2013-Dec 2)
      Passive Q-switching of an ytterbium-doped fiber (YDF) laser with few-layer topological insulator (TI) is, to the best of our knowledge, experimentally demonstrated for the first time. The few-layer TI: Bi2Se3 (2-4 layer ...
    • 106m Q-switched ytterbium-doped fiber laser using few-layer topological insulator Bi2Se3 as a saturable absorber 

      Luo, Zhengqian; Huang, Yizhong; Weng, Jian; Cheng, Huihui; Lin, Zhiqing; Xu, Bin; Cai, Zhiping; Xu, Huiying; 罗正钱 (Optical Society of America, 2013-12-02)
      Passive Q-switching of an ytterbium-doped fiber (YDF) laser with few-layer topological insulator (TI) is, to the best of our knowledge, experimentally demonstrated for the first time. The few-layer TI: Bi2Se3 (2-4 layer ...
    • 1083 nm single frequency ytterbium doped fiber laser 

      Huang, S; Feng, Y; Dong, J; Shirakawa, A; Musha, M; Ueda, K; 董俊 (2005)
      Single frequency 1083 nm ytterbium fiber laser was demonstrated by introducing loop mirror filter and polarization controller in linear laser cavity. The loop mirror with unpumped ytterbium fiber as a narrow bandwidth ...
    • 110警车配置及巡逻方案 

      林阳斌; 陈碧黎; 苏圳泷 (2010)
      针对110警车调度问题,引入了图论中的最短路算法以及计算几何的相关理论,建立了车辆调配模型、巡逻路线模型以及基于模糊数学的评价指标模型.另外,用C++编写了一个可视化的软件,不仅实现了手动描点,自动求出覆盖线段集合的功能,同时利用计算机模拟警车的巡逻路线,最后通过计算机检验得到结果,其合理性和实用性都令人满意.针对问题一,通过人机结合,配置17辆警车就能实现d1的目标,很好地兼顾了警车巡逻的运行成本,减少公安部门车辆和人员等的投入.针对 ...
    • 1270 nm hybrid cascaded phosphosilicate fiber Raman laser 

      Qi, Wei; Liu, Peng; Lu, Helin; Huang, Chaohong; 黄朝红 (Science Press, 2013 March)
      A hybrid cascaded phosphosilicate fiber Raman laser (RFL) with output wavelength of 1270 nm is proposed. By using 1330 cm-1 and 197 cm-1 Raman shift of phosphosilicate fiber, the laser of 1064 nm is shifted to 1270 nm. ...
    • 1270nm混合级联掺磷光纤拉曼激光器 

      漆伟; 刘鹏; 卢和林; 黄朝红 (2013-03-10)
      报道了一种输出波长在1270nM的混合级联掺磷拉曼激光器。该激光器分别利用掺磷光纤中频移为1330CM-1和197CM-1的拉曼散射,使1064nM激光两次频移,实现了1270nM激光输出。对1270nM的二级拉曼光设计了对称和非对称两种腔结构,并进行了对比实验。结果表明,非对称结构可有效地避免腔内激光从高反端的泄漏,降低激光阈值,提高激光器转换效率。非对称结构激光器的振荡阈值为3.70 W,抽运功率为8.66 W时,激光器最大输出总功 ...
    • 166例慢性胃炎患者舌象特征的计算机识别研究 

      许家佗; 包怡敏; 张志枫; 王志国; 裘磊; 周昌乐 (中医杂志, 2003-12)
      目的将已建立的舌色计算机识别方法应用于临床, 为检验和修正该方法提供依据。方法对166例慢性胃炎患者舌色与苔色、舌质老嫩、点刺痕点等舌象特征进行了观察分析。结果计算机程序识别有较好的识别效果, 识别总体符合率分别为舌色86.75%, 苔色92.16%, 舌象的老嫩74.10%, 点刺、窟点77.10%。结论应用计算机进行临床舌诊具有识别客观和标准恒定的优势, 具有良好的应用前景。
    • 17 MU-M EXCITED-STATE ABSORPTION MEASUREMENT IN ERBIUM-DOPED GLASSES 

      Roman, J. E.; Hempstead, M.; Ye, C. C.; Nouh, S.; Camy, P.; Laborde, P.; Lerminiaux, C.; 叶陈春 (1995)
      We have measured the complete 1.7 mu m excited state absorption (ESA) spectrum in erbium-doped glasses. The spectrum is obtained by measuring the gain of an erbium-doped waveguide in the 1400-1800 nm region. Using the ...
    • 2-μm wavelength all-fiber Q-switched double-clad fiber laser using monopiece single-layer chemical-vapor-deposition graphene 

      Huang, Yizhong; Luo, Zhengqia; Liu, Chun; Wu, Duanduan; Li, Yingyue; Le, Lili; 罗正钱 (SPIE, 2014 Octob)
      We demonstrate a large-energy 2-μm double-clad Tm-doped fiber laser (DC-TDFL) Q-switched by a monopiece single-layer graphene nanosheet. The single-layer graphene is fabricated by the chemical vapor deposition (CVD) method, ...
    • 2d hand tracking based on flocking with obstacle avoidance 

      Chen, Zihong; Zheng, Lingxiang; Chen, Yuqi; Zhang, Yixiong; 郑灵翔; 张贻雄 (INTECH EUROPE, 2014 Febru)
      Hand gesture-based interaction provides a natural and powerful means for human-computer interaction. It is also a good interface for human-robot interaction. However, most of the existing proposals are likely to fail when ...
    • 3-D Object Retrieval With Hausdorff Distance Learning 

      Gao, Yue; Wang, Meng; Ji, Rongrong; Wu, Xindong; Dai, Qionghai; 纪荣嵘 (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2014 APR)
      In view-based 3-D object retrieval, each object is described by a set of views. Group matching thus plays an important role. Previous research efforts have shown the effectiveness of Hausdorff distance in group matching. ...
    • 3D DNA Self-Assembly Model for Graph Vertex Coloring 

      张德富 (2010)
      DNA self-assembly technology has brought novel inspirations to the development of DNA computing Diversified computational models based on DNA self-assembly have been used to solve various NP problems. In this paper, a 3D ...
    • 3D Green's functions for a transversely isotropic thermoelastic cone 

      Xu, Yong-Tie; Zhang, Li-Li; 张丽丽 (APPL MATH MODEL, 2012-12)
      We use the compact harmonic general solutions of transversely isotropic thermoelastic materials to construct the three-dimensional Green's functions of a steady point heat source on the apex of a transversely isotropic ...
    • 556nm黄光激光器激光反射镜的研制 

      卜轶坤; 陈颖新; 贾富强 (强激光与粒子束, 2005-04)
      从激光晶体低增益谱线的运转机理出发,对LD泵浦Nd∶YAG,LBO腔内倍频556 nm激光器所使用的光学薄膜进行了研制。在激光反射镜的设计上,为保证基频光1 112 nm的高效振荡,并获得高的倍频556 nm激光输出,对膜系要求进行了深入分析。采用离子束反应溅射和离子辅助沉积的方法,运用时间监控膜厚法成功置备出556 nm激光器所使用的特殊的全介质激光反射膜,在国内首次实现了1 112 nm激光高效振荡,通过LBO腔内倍频,在2 ...
    • (73,37,13)QR码的一种新型代数硬判决译码算法 

      段延森; 王琳; 黎勇 (2013-10-15)
      为了将InVErSE-frEE bErlEkAMP-MASSEy(IfbM)算法用于平方剩余(QuAdrATIC rESIduE,Qr)码的译码,必须对未知校正子进行计算以获得连续校正子。现有算法所得数据无法从理论上保证对于所有可纠的错误图案,均能解得与该错误图案相对应的未知校正子,因此由该算法所得的数据需借助于仿真验证,非常耗时。鉴于此,提出一种改进算法,所得数据从理论上可保证对于所有可纠的错误图案,均能得到与之相应的未知校正子。基于 ...
    • 785 nm便携式光栅外腔可调谐半导体激光器的研制和输出特性 

      王霏; 吕雪芹; 丁鼎; 蔡丽娥 (2017-02)
      针对移频激发拉曼光谱测试系统的小型化需求,在Littrow结构中,采用商用的785; nm大功率激光二极管作为增益器件,构建了一款便携式光栅外腔可调谐半导体激光器。该激光器通过采用一种新型的波长调谐方法,即以改变半导体增益器件相对; 于准直透镜的水平位置来实现波长的连续调谐,实现了尺寸为140 mmX65 mmX50; mm的小型化结构设计。相比于传统的旋转衍射光栅改变光线在光栅上的入射角来实现波长调谐的方式,该方法有效地缩减了增益器件 ...