共查询到20条相似文献,搜索用时 843 毫秒
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经过不断地努力,2000年杭州市专利工作有了新的起色,开创了新的局面。专利申请量与授权量有了较大幅度的增长,建立了36家专利联系企业和6家专利示范企业,促进了企业的专利工作。在管理机构建设方面,加强了市专利管理处,并获得了行政执法资格,在县(市)、区管理机构建设方面,继临安市、萧山区后,西湖区、下城区、余杭区也建立了知识产权或专利管理机构,未建立的县(市)、区和各局公司,都明确了职能处室,并有专人负责,初步形成了专利管理服务体系。 然而,尽管2000年全市专利工作取得了一定成绩,但与杭州市科技经… 相似文献
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徐杰舜 《广西民族大学学报》2003,(Z1)
申请赴台历经了一番“磨难”,台湾之行收获颇多,在岛内感受了其交通的便利,留下了对其大学的印象,进行了难忘的研讨会,领略了其学者们的风采,与台湾亲密接触了一回。 相似文献
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The diffraction efficiency of volume grating written by two wave mixing in Ce:KNSBN photorefractive crystal versus the writing
beam ratio for ordinarily polarized reading beam is experimentally studied. The result is different from that for the extraordinarily
polarized reading beam. Then the modified coupled-wave theory is used to fit the experimental data. The theoretical results
are coincident with the experimental data quite well. This research gives a significant support to the applications of Ce:KNSBN
crystal in holographic recording and optical information processing. 相似文献
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In this paper, the applications of orthogonal linear polarized lasers in self-sensing are reviewed. The properties for such a laser include the production of a new frequency in one longitudinal mode spacing, the tuning of frequency difference, the change of polarization states as cavity tuning, the control of mode competition intensity, the optical feedback, and so on. The orthogonal polarized lasers have been used as a laser nanometer ruler based on competition between two polarized lights in a HeNe laser and as a displacement measurement tool based on the optical feedback in the orthogonal polarized lasers. They are also used in the phase retardation measurement of a waveplate, the angle measurement, the vibration measurement, the pressure/force measurement, the weak magnetic field measurement,and so on. The structures of these new devices are simple and compact with the great advantages of high resolution and high accuracy.Some of these devices can trace to the source of the laser wavelength. The nanometer laser ruler is an example whose measurement range is 12 mm, resolution is 79 nm and linearity is less than 5×10- 5. The repeatability of the phase retardation measuring system of waveplate can reach 3'. 相似文献
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报导了一种新的非相干 -相干光学转换方法 ,该方法是基于对介质中光致各向异性的局部擦除 样品放置在两个相互正交的偏振片之间 ,用线偏振的泵浦光在样品中产生稳定的双折射 ,然后通过入射非相干图象光进行局部擦除 ,相干图象由一束He -Ne激光读出 所得相干图象为输入非相干图象的负片 利用偶氮侧链液晶聚合物薄膜样品实现了图象的非相干 -相干光学转换 相似文献
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Short-wavelength static optical recording properties of subphthalocyanine thin films 总被引:2,自引:0,他引:2
The static optical recording properties of novel bromoboron trinitro-subphthalocyanine (BTN-SubPc) thin films were studied
using a self-developed short-wavelength optical disk tester with high NA objective lens. High reflectivity contrast (>30%)
was obtained at low writing power (8 mW) and short writing pulsewidth (200 ns) using the Ar+ laser (514.5 nm) irradiation. These results demonstrate that subphthalocyanine is not only qualified for red-light recording
but also a promising candidate for the recording medium of a green-light DVD-R. The leading edge, just like the falling edge,
of the dye’s absorption band can also be used to realize optical disk storage if an appropriate reflector was used. It provides
a new clew for double-wavelength writing/reading and choosing short-wavelength recording materials. 相似文献
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在数字音频唱机(CD)的开发方面,激光二极管(LD)由于具有一系列独特的优点,在科学与工程应用领域获得越来越广泛的应用.值得指出的是,LD激光器其光学和电气特性方面存在一些特别的问题,LD输出光束是:a.发散的;b.椭圆的;C.存在固有像散.环境温度的变化不仅影响其使用寿命,还会影响到其波长漂移和量子效率的变化.因此在实用时,必须对LD光束进行高质量准直,同时还应考虑系统的光能利用效率问题.为此,在研制高性能LD准直光源时,必须解决好以下四个问题:a.设计好准直物镜使其与激光二极管特性相匹配;b.设计合适的机械机构使LD与准直物镜集于一体,同时能够方便地进行精密光学对准,而且要具有一定的机械强度,使其能够承受一定的振动与冲击;C.研制有效的质量测试系统,以确保获得高质量的准直光束;d.研制安全可靠的LD驱动电源,以确保使用安全,延长寿命. 相似文献
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PAZOS的合成及其薄膜的光信息存储研究 总被引:1,自引:0,他引:1
郭建明 《河北师范大学学报(自然科学版)》1998,22(3):354-358
合成并表征了聚「3’-甲基-4’-二(N,N-氧亚乙基)氨基-4-硝基偶氮苯登二酰」(PAZOS), 相似文献
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Ce:KNSBN光折变晶体两波耦合特性研究 总被引:1,自引:1,他引:0
采用Ar+ 514.5nm的o光和e光测量了Ce:KNSBN晶体两波耦合增益系数随写入光夹角的变化关系曲线 ,得到了Ce:KNSBN晶体的有效电荷密度、有效电光系数和电子 -空穴对抗率等参数.依据光折变理论对增益系数随写入光夹角变化关系实验数据进行了拟合 ,拟合曲线与实验结果符合较好 相似文献
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我们利用暗场显微镜系统地研究了水剂磁性液体中Fe3O4磁性纳米颗粒在高度聚焦激光作用下的动力学过程.实验研究表明:当激光聚焦在样品池中间时,由于受到沿激光入射方向强散射力和吸收力的作用,磁性纳米颗粒会被排开至光斑的外围;当激光聚焦在样品池上表面时,在光力和样品池上玻片的共同作用下,磁性纳米颗粒会被捕获在样品池的上玻片的下表面并发生团聚效应;此外,我们还研究了不同激光功率作用下形成的磁性纳米团簇对入射白光的透过谱的影响,随着入射激光功率的增加,透过磁性液体的白光的透过率会急剧下降,而且透射谱的中心波长会随着入射激光功率的增加往长波方向移动. 相似文献
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在分析双频激光回馈测量原理的基础上,提出了一种基于双频激光回馈原理的高精度位移测量方法,研究了双频激光回馈的基本现象并给出了理论依据,进一步在回馈光学系统基础上,对两路正交的光回馈条纹,利用电路进行细分处理:即5细分和4倍频电路相结合,细分产生的计数脉冲最后送入单片机进行计算及显示.采用可编程逻辑器件FPGA和单片机设计信号处理电路,利用FPGA实现4倍频细分,利用电阻链细分实现5细分.全部电路通过逻辑、时序仿真,验证了本方法的可行性.目前此系统可满足高精度位移测量的要求. 相似文献