共查询到20条相似文献,搜索用时 62 毫秒
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该文介绍了一种利用反常声光互作用原理制作的大带宽声光偏转器。该器件使用的声光互作用介质是磷化镓晶体,声波模式是横波,采用单片换能器结构,实现了带宽与衍射效率的合理兼顾。制作的大带宽声光偏转器样品的3dB带宽达1 040MHz,峰值衍射效率达20.4%@1W,这时中心频率为1.62GHz,光波长是633nm。 相似文献
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本文介绍了本所高分辨率声光偏转技术的最新研究成果.采用TeO_2单晶体作声光介质,大通光孔径结构,研制出了宽频带、高衍射效率、频率分辨率高的高分辨率声光偏转器.器件同采用频率合成技术的高频率稳定度驱动信号源在实际光路中联调,实现了工作光波长632.8nm(He-Ne激光),中心频率70±4MHz,带宽>40MHz,频率分辨率不劣于20kHz,器件的光偏转角度同驱动信号频率呈良好的线性.这一新型的声光技术可用在激光缩微技术,射电天文中的频谱仪,声光侦察接收机,光计算机等方面,其应用前景十分广阔. 相似文献
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在集成光学信息处理和通讯系统中,声光Bragg偏转器是关键性的有源器件,因此实现具有尽可能宽的带宽和尽可能高的偏转效率的器件是很重要的.我们在钛扩散Y-切LiNbO_3平面光波导上利用两个倾斜SAW相控阵换能器设计制作了导波声光Bragg偏转器.用0.63μmHe-Ne激光进行了Bragg偏转实验,光斑质量较好.在280MHz的中心频率上测得200MHz的偏转带宽和在210mWRF驱动功率下40%的偏转效率.最后,评价了这种宽带偏转器结构的优缺点,例举了在光通讯和RF信息处理中的应用. 相似文献
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The article describes a model representation of radar probing data in form of a mixture of background and target samples, which is the sum of two random variables with very different parameters. For model development we research the behavior of the central moments of the distribution mix without assuming the distribution law form. An example it is described the detection of the signal at the output of compression system of chirp ionosonde. 相似文献
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解决IP网QoS问题是目前通信领域的研究热点之一.虽然研究已经取得了一定的进展,但人们对于IP 网QoS本身的含义及相关的问题还有着不同的理解.本文将从IP网QoS的定义入手讨论相关的一些问题以及解决IP网QoS问题所做的各种努力. 相似文献
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《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1968,56(6):1024-1032
Assuming that visual responses are due to the action of particles on the membrane of the visual cells, the stochastic variability of the response should be a function of the number of particles producing it. Quantitative predictions can be made with the aid of a model proposed in previous articles. It is found that responses produced in visual cells of Limulus by absorption of a single photon have the stochastic properties which would be expected if the response to one photon were brought about by 25 particles. It is concluded from this that the processes leading to visual responses produce multiplication of particles. The effects of temperature and of metabolic poisons suggest that these processes are of chemical nature. 相似文献
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A. M. Emel’yanov 《Semiconductors》2010,44(9):1134-1139
A method for analyzing the luminescence spectra of semiconductors is suggested. The method is based on differentiation of
the spectra. The potentialities of the method are demonstrated for luminescence in the region of the fundamental absorption
edge of Si and SiGe alloy single crystals. The method is superior in accuracy to previously known luminescence methods of
determining the band gap of indirect-gap semiconductors and practically insensitive to different conditions of outputting
radiation from the sample. 相似文献
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“计算机组成原理”设计性实践教学模式研究 总被引:1,自引:0,他引:1
本文阐述了"计算机组成原理"设计性实验教学的重要性,对设计性实验教学的目的和基本特征进行了归纳,对"计算机组成原理"设计性实验教学的现状进行了调查,对存在的问题进行了较深入的分析;在此基础上.对组成原理设计性实验的教学模式进行了研究,对设计性实验的体系进行了初步设计,并对"计算机组成原理"设计性实验的实施方法进行了探讨. 相似文献